diff --git a/src/system/kernel/platform/openfirmware/openfirmware.cpp b/src/system/kernel/platform/openfirmware/openfirmware.cpp
index 8c0f7e06e5..1f1d997496 100644
--- a/src/system/kernel/platform/openfirmware/openfirmware.cpp
+++ b/src/system/kernel/platform/openfirmware/openfirmware.cpp
@@ -559,7 +559,8 @@ of_milliseconds(void)
 		int			milliseconds;
 	} args = {"milliseconds", 0, 1, 0};
 
-	gCallOpenFirmware(&args);
+	if (gCallOpenFirmware(&args) == OF_FAILED)
+		return OF_FAILED;
 
 	return args.milliseconds;
 }