diff --git a/kernel/x86_64/iamax_sse.S b/kernel/x86_64/iamax_sse.S
index 4f62b9be2..14c7f43ec 100644
--- a/kernel/x86_64/iamax_sse.S
+++ b/kernel/x86_64/iamax_sse.S
@@ -51,6 +51,8 @@
 #define MAXPS	maxps
 #define MAXSS	maxss
 #ifdef USE_MIN
+#undef MAXPS
+#undef MAXSS
 #define MAXPS	minps
 #define MAXSS	minss
 #endif