diff --git a/Makefile.coq.local b/Makefile.coq.local
index e1eac9f8ce165511bdffce223eb34fb314f41746..3f0d55bd630247560c11e9a84e942b48aea8b44e 100644
--- a/Makefile.coq.local
+++ b/Makefile.coq.local
@@ -52,6 +52,6 @@ $(TESTFILES:.v=.vo): %.vo: %.v $(if $(MAKE_REF),,%.ref) $(NORMALIZER)
 	  $(TIMER) $(COQ_TEST) $(COQFLAGS) $(COQLIBS) -load-vernac-source $< > "$$TMPFILE" && \
 	  sed -f $(NORMALIZER) "$$TMPFILE" > "$$TMPFILE".new && \
 	  mv "$$TMPFILE".new "$$TMPFILE" && \
-	  $(if $(MAKE_REF),mv "$$TMPFILE" "$$REF",diff -u "$$REF" "$$TMPFILE") && \
+	  $(if $(MAKE_REF),mv "$$TMPFILE" "$$REF",diff --strip-trailing-cr -u "$$REF" "$$TMPFILE") && \
 	  rm -f "$$TMPFILE" && \
 	  touch $@