diff --git a/include/tests_filesystems b/include/tests_filesystems
index eecb621b..e048a518 100644
--- a/include/tests_filesystems
+++ b/include/tests_filesystems
@@ -688,6 +688,7 @@
             LIST_FS_NOT_SUPPORTED="cramfs freevxfs hfs hfsplus jffs2 squashfs udf"
             FOUND=0
             AVAILABLE_FS=""
+            AVAILABLE_MODPROBE_FS=""
             for FS in ${LIST_FS_NOT_SUPPORTED}; do
                 # Check if filesystem is present in modprobe output
                 FIND=`${MODPROBEBINARY} -v -n $FS 2>/dev/null | ${EGREPBINARY} "/${FS}.ko" | tail -1`
@@ -720,6 +721,7 @@
         else
             LogText "Test skipped lsmod binary not found or /proc/modules can not be opened"
         fi
+        unset AVAILABLE_FS AVAILABLE_MODPROBE_FS
     fi
 #
 #################################################################################