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diff --git a/erlang.mk b/erlang.mk
index efbcf5c..65fb954 100644
--- a/erlang.mk
+++ b/erlang.mk
@@ -4991,7 +4991,7 @@ ifeq ($(wildcard src/$(PROJECT).app.src),)
$(app_verbose) printf "$(subst $(newline),\n,$(subst ",\",$(call app_file,$(GITDESCRIBE),$(MODULES))))" \
> ebin/$(PROJECT).app
else
- $(verbose) if [ -z "$$(grep -E '^[^%]*{\s*modules\s*,' src/$(PROJECT).app.src)" ]; then \
+ $(verbose) if [ -z "$$(grep -e '^[^%]*{\s*modules\s*,' src/$(PROJECT).app.src)" ]; then \
echo "Empty modules entry not found in $(PROJECT).app.src. Please consult the erlang.mk README for instructions." >&2; \
exit 1; \
fi
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