diff --git a/src/go/types/eval_test.go b/src/go/types/eval_test.go
index 49d901f692..f7f0da0db9 100644
--- a/src/go/types/eval_test.go
+++ b/src/go/types/eval_test.go
@@ -208,7 +208,7 @@ func TestEvalPos(t *testing.T) {
 }
 
 // gotypesalias controls the use of Alias types.
-var gotypesalias = godebug.New("#gotypesalias")
+var gotypesalias = godebug.New("gotypesalias")
 
 // split splits string s at the first occurrence of s, trimming spaces.
 func split(s, sep string) (string, string) {