diff --git a/tests/5_container_runtime.sh b/tests/5_container_runtime.sh
index 7c6ff7a..da24030 100644
--- a/tests/5_container_runtime.sh
+++ b/tests/5_container_runtime.sh
@@ -110,7 +110,8 @@ else
 
   # List of sensitive directories to test for. Script uses new-lines as a separator.
   # Note the lack of identation. It needs it for the substring comparison.
-  sensitive_dirs='/boot
+  sensitive_dirs='/
+/boot
 /dev
 /etc
 /lib
@@ -127,7 +128,9 @@ else
     # Go over each directory in sensitive dir and see if they exist in the volumes
     for v in $sensitive_dirs; do
       sensitive=0
-      contains "$volumes" "$v" && sensitive=1
+      if echo "$volumes" | grep -e "{.*\s$v\s.*true\s}" 2>/tmp/null 1>&2; then
+        sensitive=1
+      fi
       if [ $sensitive -eq 1 ]; then
         # If it's the first container, fail the test
         if [ $fail -eq 0 ]; then