--- a/js/src/Makefile.in
+++ b/js/src/Makefile.in
@@ -623,17 +623,17 @@ ifeq ($(MOZ_DEBUG),1)
 #check:: check-ooms
 endif
 
 ## Prevent regressing in our deprecation of non-preferred memory management functions.
 # We use all the files in the distribution so that different configurations
 # don't give different results. We skip the contents of objdirs using |find|
 # (it can't be done with %-expansion, because the files we want to skip aren't
 # in the vpath).
-ALL_FILES=$(shell find $(srcdir) \( -name "*.cpp" -o -name "*.h" \) -not -path "*/dist/*" -not -path "*/config/*")
+ALL_FILES=$(shell find $(srcdir) \( -name "*.cpp" -o -name "*.h" \) ! -path "*/dist/*" ! -path "*/config/*")
 check-malloc-function-usage: $(filter-out %jsalloc.h %jscntxt.h %jsutil.h, $(ALL_FILES))
 
 	# js_malloc and friends are only used by other memory managers, and should
 	# never be used elsewhere directly.
 	$(srcdir)/config/check_source_count.py "\bjs_malloc\b" 0 \
 		"in Makefile.in" "cx->malloc_ or rt->malloc_" $^
 	$(srcdir)/config/check_source_count.py "\bjs_calloc\b" 0 \
 		"in Makefile.in" "cx->calloc_ or rt->calloc_" $^