diff --git a/tests/playTests.sh b/tests/playTests.sh
index 99325976a..c84cd6a1b 100755
--- a/tests/playTests.sh
+++ b/tests/playTests.sh
@@ -78,6 +78,11 @@ println() {
     printf '%b\n' "${*}"
 }
 
+if [ -z "${size}" ]; then
+    size=
+else
+    size=${size}
+fi
 
 SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
 PRGDIR="$SCRIPT_DIR/../programs"