diff --git a/build-helpers/make-linux-build-docker-inner.sh b/build-helpers/make-linux-build-docker-inner.sh
index 516143788f5fcde3a10e717cb90bd555a46fca5c..1d537760e834b7279c694e726b5d2d1bb90cee93 100755
--- a/build-helpers/make-linux-build-docker-inner.sh
+++ b/build-helpers/make-linux-build-docker-inner.sh
@@ -24,7 +24,7 @@ curl -k https://gitlab.tiker.net/inducer/pip/raw/7.0.3/contrib/get-pip.py | pyth
 
 pip install packaging
 
-PYTHON_VER=$($PYTHON_EXE -c 'import sys; print(".".join(str(s) for s in sys.version_info[:2]))')
+PYTHON_VER=$(python -c 'import sys; print(".".join(str(s) for s in sys.version_info[:2]))')
 if test "$PYTHON_VER" = "2.6"; then
   pip install pyinstaller==2.1
 else