--- a/sbin/firehol
+++ b/sbin/firehol
@@ -10295,7 +10295,7 @@
 	kmaj=$1
 	kmin=$2

-	set -- $($UNAME_CMD -r)
+	set -- $("$UNAME_CMD" -r)
 	eval $kmaj=\$1 $kmin=\$2
 }
 kernel_maj_min KERNELMAJ KERNELMIN