diff --git a/src/cmd/cgo/main.go b/src/cmd/cgo/main.go
index c3e319f92c..d1b551b555 100644
--- a/src/cmd/cgo/main.go
+++ b/src/cmd/cgo/main.go
@@ -94,7 +94,8 @@ func main() {
 			case "call":
 				if !cref.TypeName {
 					// Is an actual function call.
-					*cref.Expr = &ast.Ident{Value: "_C_" + cref.Name}
+					pos := (*cref.Expr).Pos()
+					*cref.Expr = &ast.Ident{Position: pos, Value: "_C_" + cref.Name}
 					p.Funcdef[cref.Name] = cref.FuncType
 					break
 				}