diff --git a/src/import/__snapshots__/pprof.test.ts.snap b/src/import/__snapshots__/pprof.test.ts.snap
index 69517d5..42f2d38 100644
--- a/src/import/__snapshots__/pprof.test.ts.snap
+++ b/src/import/__snapshots__/pprof.test.ts.snap
@@ -7,7 +7,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.main:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 198,
       "name": "runtime.main",
       "selfWeight": 0,
       "totalWeight": 1360000000,
@@ -16,7 +16,7 @@ Object {
       "col": undefined,
       "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
       "key": "main.main:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
-      "line": 0,
+      "line": 49,
       "name": "main.main",
       "selfWeight": 0,
       "totalWeight": 1360000000,
@@ -25,7 +25,7 @@ Object {
       "col": undefined,
       "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
       "key": "main.delta:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
-      "line": 0,
+      "line": 28,
       "name": "main.delta",
       "selfWeight": 220000000,
       "totalWeight": 580000000,
@@ -34,7 +34,7 @@ Object {
       "col": undefined,
       "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
       "key": "main.beta:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
-      "line": 0,
+      "line": 18,
       "name": "main.beta",
       "selfWeight": 390000000,
       "totalWeight": 390000000,
@@ -43,7 +43,7 @@ Object {
       "col": undefined,
       "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
       "key": "main.alpha:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
-      "line": 0,
+      "line": 11,
       "name": "main.alpha",
       "selfWeight": 480000000,
       "totalWeight": 480000000,
@@ -52,7 +52,7 @@ Object {
       "col": undefined,
       "file": "/Users/jlfwong/code/speedscope/sample/programs/go/simple.go",
       "key": "main.gamma:/Users/jlfwong/code/speedscope/sample/programs/go/simple.go:0",
-      "line": 0,
+      "line": 34,
       "name": "main.gamma",
       "selfWeight": 270000000,
       "totalWeight": 270000000,
@@ -61,7 +61,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s",
       "key": "runtime.morestack:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s:0",
-      "line": 0,
+      "line": 480,
       "name": "runtime.morestack",
       "selfWeight": 0,
       "totalWeight": 110000000,
@@ -70,7 +70,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/stack.go",
       "key": "runtime.newstack:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/stack.go:0",
-      "line": 0,
+      "line": 957,
       "name": "runtime.newstack",
       "selfWeight": 0,
       "totalWeight": 110000000,
@@ -79,7 +79,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/duff_amd64.s",
       "key": "runtime.duffcopy:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/duff_amd64.s:0",
-      "line": 0,
+      "line": 412,
       "name": "runtime.duffcopy",
       "selfWeight": 110000000,
       "totalWeight": 110000000,
@@ -88,7 +88,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go",
       "key": "runtime.timerproc:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go:0",
-      "line": 0,
+      "line": 247,
       "name": "runtime.timerproc",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -97,7 +97,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go",
       "key": "runtime.goroutineReady:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/time.go:0",
-      "line": 0,
+      "line": 125,
       "name": "runtime.goroutineReady",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -106,7 +106,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.goready:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 301,
       "name": "runtime.goready",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -115,7 +115,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s",
       "key": "runtime.systemstack:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/asm_amd64.s:0",
-      "line": 0,
+      "line": 409,
       "name": "runtime.systemstack",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -124,7 +124,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.goready.func1:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 302,
       "name": "runtime.goready.func1",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -133,7 +133,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.ready:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 608,
       "name": "runtime.ready",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -142,7 +142,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.wakep:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 2083,
       "name": "runtime.wakep",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -151,7 +151,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.startm:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 2017,
       "name": "runtime.startm",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -160,7 +160,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/lock_sema.go",
       "key": "runtime.notewakeup:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/lock_sema.go:0",
-      "line": 0,
+      "line": 147,
       "name": "runtime.notewakeup",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -169,7 +169,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go",
       "key": "runtime.semawakeup:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go:0",
-      "line": 0,
+      "line": 36,
       "name": "runtime.semawakeup",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -178,7 +178,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go",
       "key": "runtime.mach_semrelease:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/os_darwin.go:0",
-      "line": 0,
+      "line": 465,
       "name": "runtime.mach_semrelease",
       "selfWeight": 0,
       "totalWeight": 10000000,
@@ -187,7 +187,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s",
       "key": "runtime.mach_semaphore_signal:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s:0",
-      "line": 0,
+      "line": 558,
       "name": "runtime.mach_semaphore_signal",
       "selfWeight": 10000000,
       "totalWeight": 10000000,
@@ -196,7 +196,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.mstart:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 1193,
       "name": "runtime.mstart",
       "selfWeight": 0,
       "totalWeight": 20000000,
@@ -205,7 +205,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.mstart1:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 1227,
       "name": "runtime.mstart1",
       "selfWeight": 0,
       "totalWeight": 20000000,
@@ -214,7 +214,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go",
       "key": "runtime.sysmon:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/proc.go:0",
-      "line": 0,
+      "line": 4221,
       "name": "runtime.sysmon",
       "selfWeight": 0,
       "totalWeight": 20000000,
@@ -223,7 +223,7 @@ Object {
       "col": undefined,
       "file": "/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s",
       "key": "runtime.usleep:/usr/local/Cellar/go/1.10.1/libexec/src/runtime/sys_darwin_amd64.s:0",
-      "line": 0,
+      "line": 418,
       "name": "runtime.usleep",
       "selfWeight": 20000000,
       "totalWeight": 20000000,
diff --git a/src/import/pprof.ts b/src/import/pprof.ts
index eb271eb..d21f64f 100644
--- a/src/import/pprof.ts
+++ b/src/import/pprof.ts
@@ -2,6 +2,7 @@ import {perftools} from './profile.proto.js'
 import {FrameInfo, StackListProfileBuilder, Profile} from '../lib/profile'
 import {lastOf} from '../lib/utils'
 import {TimeFormatter, ByteFormatter} from '../lib/value-formatters'
+import Long from 'long'
 
 interface SampleType {
   type: string
@@ -100,7 +101,12 @@ export function importAsPprofProfile(rawProfile: ArrayBuffer): Profile | null {
     if (lastLine == null) return null
 
     if (lastLine.functionId) {
-      return frameInfoByFunctionID.get(i32(lastLine.functionId)) || null
+      let funcFrame = frameInfoByFunctionID.get(i32(lastLine.functionId))
+      const line = lastLine.line instanceof Long ? lastLine.line.toNumber() : lastLine.line
+      if (line && line > 0 && funcFrame != null) {
+        funcFrame.line = line
+      }
+      return funcFrame || null
     } else {
       return null
     }