diff --git a/scripts/generate-kernel-patch b/scripts/generate-kernel-patch
index 85bc33306..58bcf20ce 100755
--- a/scripts/generate-kernel-patch
+++ b/scripts/generate-kernel-patch
@@ -209,7 +209,7 @@ fi
 # Strip patch level from the kernel version number.
 if [ "${1#[0-9]*.[0-9]*.[0-9]*.[0-9]*}" != "$1" ]; then
   kernel_version="${1%.[0-9]*}"
-  patch_level="${1%${kernel_version}}"
+  patch_level="${1#${kernel_version}.}"
 else
   kernel_version="$1"
 fi