Use proper command variables
diff --git a/Makefile.am b/Makefile.am
index 49ce88a..de89b32 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -282,4 +282,4 @@
 	$(AM_V_GEN)$(LN_S) $(abs_top_srcdir)/$< $@
 
 clean-local: lib/bluetooth
-	@rm -r $<
+	@$(RM) -r $<