diff --git a/androidmk/parser/scope.go b/androidmk/parser/scope.go
index 8111c89..e1a523a 100644
--- a/androidmk/parser/scope.go
+++ b/androidmk/parser/scope.go
@@ -14,9 +14,7 @@
 
 package parser
 
-import (
-	"strings"
-)
+import "strings"
 
 type Scope interface {
 	Get(name string) string
@@ -88,7 +86,7 @@
 			if fname == "call" {
 				return scope.Call(argVals[0], argVals[1:]), true
 			} else {
-				return []string{"__builtin_func:" + fname + " " + strings.Join(argVals, " ")}, true
+				return []string{"UNSUPPORTED FUNCTION:" + fname + " " + strings.Join(argVals, " ")}, true
 			}
 		}
 	}