diff --git a/Rules.modular b/Rules.modular
index f7ee2c11f..c731ea01d 100644
--- a/Rules.modular
+++ b/Rules.modular
@@ -119,8 +119,8 @@ $(tmpdir)/seusers: $(seusers)
 
 $(users_extra): $(m4support) $(user_files)
 	@test -d $(tmpdir) || mkdir -p $(tmpdir)
-	$(verbose) $(M4) $(M4PARAM) -D users_extra $^ | \
-		$(SED) -r -n -e 's/^[[:blank:]]*//g' -e '/^user/p' > $@
+	$(verbose) $(M4) $(M4PARAM) -D users_extra $^ > $(tmpdir)/$(@F).tmp
+	$(verbose) $(SED) -r -n -e 's/^[[:blank:]]*//g' -e '/^user/p' $(tmpdir)/$(@F).tmp > $@
 
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 #