diff --git a/Make.rules.in b/Make.rules.in
index 37e78c98916..8d0358cd5cc 100644
--- a/Make.rules.in
+++ b/Make.rules.in
@@ -79,7 +79,7 @@ OBJS = $(C_SRCS:.c=.o) $(GEN_ASM_SRCS:.s=.o) $(ASM_SRCS:.S=.o) \
 	$(CC) -c $(ALLCFLAGS) -o $*.o $<
 
 .s.o:
-	$(CC) -c -o $*.o $<  
+	$(AS) -o $*.o $<  
 
 .S.o:
 	$(CC) -c -o $*.o $<