diff --git a/tests/5_container_runtime.sh b/tests/5_container_runtime.sh
index a9ff634..156cba3 100644
--- a/tests/5_container_runtime.sh
+++ b/tests/5_container_runtime.sh
@@ -172,10 +172,10 @@ else
 
   fail=0
   for c in $containers; do
-    docker exec "$c" ps -el 2>/dev/null
+    exec_check=$(docker exec "$c" ps -el 2>/dev/null)
     if [ $? -eq 255 ]; then
       warn "$check_5_7"
-      warn "     * Docker exec failed: $c"
+      warn "      * Docker exec fails: $c"
       fail=1
     fi