diff --git a/build-and-benchmark-py-project.sh b/build-and-benchmark-py-project.sh
index 5997df579be9dd560bdf75c918aa524635ffd0e2..e95f61291f8feeedee6f8e342428fda27579d08b 100644
--- a/build-and-benchmark-py-project.sh
+++ b/build-and-benchmark-py-project.sh
@@ -7,7 +7,7 @@ conda list
 
 PY_EXE=python
 
-if [[ ! -z "$PROJECT" ]]; then
+if [[ -z "$PROJECT" ]]; then
     echo "PROJECT env var not set"
     exit 1
 fi