diff --git a/src/cmd/compile/fmt_test.go b/src/cmd/compile/fmt_test.go
index fa5ea386124..544179e414a 100644
--- a/src/cmd/compile/fmt_test.go
+++ b/src/cmd/compile/fmt_test.go
@@ -656,6 +656,7 @@ var knownFormats = map[string]string{
 	"cmd/compile/internal/syntax.token %s":            "",
 	"cmd/internal/obj.As %v":                          "",
 	"cmd/internal/src.Pos %s":                         "",
+	"cmd/internal/src.Pos %v":                         "",
 	"error %v":                                        "",
 	"float64 %.2f":                                    "",
 	"float64 %.3f":                                    "",