diff --git a/pack.sh b/pack.sh
index a61a461ce9f3e..de48b7dea0c2f 100755
--- a/pack.sh
+++ b/pack.sh
@@ -84,7 +84,7 @@ cp ${changelog_file} ${distdir}/CHANGELOG.md
 # defensive: make sure our artifacts don't use the version marker (this means
 # that "pack" will always fails when building in a dev environment)
 # when we get to 10.0.0, we can fix this...
-if find dist/ | grep "${marker}"; then
+if find dist/ | grep -F "${marker}"; then
   echo "ERROR: build artifacts use the version marker '${marker}' instead of a real version."
   echo "This is expected for builds in a development environment but should not happen in CI builds!"
   exit 1