diff --git a/tests/SkRuntimeEffectTest.cpp b/tests/SkRuntimeEffectTest.cpp
index ec784e5..9e2ebda 100644
--- a/tests/SkRuntimeEffectTest.cpp
+++ b/tests/SkRuntimeEffectTest.cpp
@@ -52,7 +52,7 @@
 
 DEF_TEST(SkRuntimeEffectInvalid_UndefinedFunction, r) {
     test_invalid_effect(r, "half4 missing(); half4 main(float2 p) { return missing(); }",
-                           "undefined function");
+                           "function 'half4 missing()' is not defined");
 }
 
 DEF_TEST(SkRuntimeEffectInvalid_UndefinedMain, r) {