diff --git a/misc/ios/go_darwin_arm_exec.go b/misc/ios/go_darwin_arm_exec.go
index debd2cdb30..4d658e770c 100644
--- a/misc/ios/go_darwin_arm_exec.go
+++ b/misc/ios/go_darwin_arm_exec.go
@@ -103,7 +103,7 @@ func main() {
 func getenv(envvar string) string {
 	s := os.Getenv(envvar)
 	if s == "" {
-		log.Fatalf("%s not set\nrun $GOROOT/misc/ios/detect.go to attempt to autodetect", s)
+		log.Fatalf("%s not set\nrun $GOROOT/misc/ios/detect.go to attempt to autodetect", envvar)
 	}
 	return s
 }