diff --git a/src/common.mk.in b/src/common.mk.in
index 0f090a8..9c133e0 100644
--- a/src/common.mk.in
+++ b/src/common.mk.in
@@ -32,7 +32,7 @@ OBJECTS = $(SOURCES:%.c=%.o)
 all:
 
 %.a:
-	ar r $@ $^
+	$(AR) r $@ $^
 	$(RANLIB) $@
 
 %.o: %.c