diff --git a/src/runtime/stack.go b/src/runtime/stack.go
index 5ef9b7ad..c1522088 100644
--- a/src/runtime/stack.go
+++ b/src/runtime/stack.go
@@ -11,6 +11,10 @@ func (f *Func) Name() string {
 	return ""
 }
 
+func (f *Func) FileLine(pc uintptr) (file string, line int) {
+	return "", 0
+}
+
 func Caller(skip int) (pc uintptr, file string, line int, ok bool) {
 	return 0, "", 0, false
 }
diff --git a/src/runtime/symtab.go b/src/runtime/symtab.go
index 0a3ca3da..cfc9885d 100644
--- a/src/runtime/symtab.go
+++ b/src/runtime/symtab.go
@@ -9,6 +9,7 @@ type Frame struct {
 
 	File string
 	Line int
+	PC   uintptr
 }
 
 func CallersFrames(callers []uintptr) *Frames {