diff --git a/entrypoint.sh b/entrypoint.sh
index 3acaab8..7ed1228 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -17,6 +17,8 @@ PYPI_INDEX_URL=$3
 
 WORKDIR=${SRCDIR:-/src}
 
+SPEC_FILE="${SRCDIR}/${4}"
+
 #
 # In case the user specified a custom URL for PYPI, then use
 # that one, instead of the default one.
@@ -44,7 +46,7 @@ fi # [ -f requirements.txt ]
 
 
 # if [[ "$@" == "" ]]; then
-pyinstaller --clean -y --dist ./dist/windows --workpath /tmp *.spec
+pyinstaller --clean -y --dist ./dist/windows --workpath /tmp $SPEC_FILE
 chown -R --reference=. ./dist/windows
 # else
     # sh -c "$@"