diff --git a/programs/develop/libraries/menuetlibc/src/Make.rules b/programs/develop/libraries/menuetlibc/src/Make.rules
index 1d1053a177..7911b513e2 100755
--- a/programs/develop/libraries/menuetlibc/src/Make.rules
+++ b/programs/develop/libraries/menuetlibc/src/Make.rules
@@ -18,7 +18,7 @@ DEBUG = 0
 	$(NASM) $*.asm -o $*.o -f $(ASMFMT)
 	
 .s.o:
-	$(AS) -nostdinc -I$(MENUETDEV)/include $*.s -o $*.sx $(CSFLAGS) -DMENUETDEV=$(MENUETDEV) -D__DEV_CONFIG_H=\"$(MENUETDEV)/config.h\"
+	$(CPP) -nostdinc -I$(MENUETDEV)/include $*.s -o $*.sx $(CSFLAGS) -DMENUETDEV=$(MENUETDEV) -D__DEV_CONFIG_H=\"$(MENUETDEV)/config.h\"
 	as $*.sx $(AS32OPT) -o $*.o
 	$(RM) $*.sx