diff --git a/Makefile.include b/Makefile.include
index 7836f9ffe..f072df1ca 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -123,7 +123,7 @@ endif
 
 ifndef CUSTOM_RULE_S_TO_OBJECTDIR_O
 $(OBJECTDIR)/%.o: %.S
-	$(AS) $(ASFLAGS) $< -o $@
+	$(AS) $(ASFLAGS) -o $@ $<
 endif
 
 ifndef CUSTOM_RULE_C_TO_O