diff --git a/src/python/pypresso.cmakein b/src/python/pypresso.cmakein
index 0ac8df00cb5..8476da0fa64 100755
--- a/src/python/pypresso.cmakein
+++ b/src/python/pypresso.cmakein
@@ -8,9 +8,9 @@
 #
 
 if test -n "$PYTHONPATH"; then
-  PYTHONPATH=@PYTHON_DIR@:$PYTHONPATH
+  PYTHONPATH="@PYTHON_DIR@:$PYTHONPATH"
 else
-  PYTHONPATH=@PYTHON_DIR@
+  PYTHONPATH="@PYTHON_DIR@"
 fi
 export PYTHONPATH