diff --git a/install.sh b/install.sh
index e0b6510..03506fc 100755
--- a/install.sh
+++ b/install.sh
@@ -78,11 +78,11 @@ function get_kernel_version() {
 
 function check_kernel_headers() {
   VER_RUN=$(get_kernel_version)
-  VER_HDR=$(dpkg -L raspberrypi-kernel-headers | egrep -m1 "/lib/modules/[[:print:]]+/build" | awk -F'/' '{ print $4; }')
+  VER_HDR=$(dpkg -L raspberrypi-kernel-headers | egrep -m1 "/lib/modules/[^\/]+/build" | awk -F'/' '{ print $4; }')
   [ "X$VER_RUN" == "X$VER_HDR" ] && {
     return 0
   }
-  VER_HDR=$(dpkg -L linux-headers-$VER_RUN | egrep -m1 "/lib/modules/[[:print:]]+/build" | awk -F'/' '{ print $4; }')
+  VER_HDR=$(dpkg -L linux-headers-$VER_RUN | egrep -m1 "/lib/modules/[^\/]+/build" | awk -F'/' '{ print $4; }')
   [ "X$VER_RUN" == "X$VER_HDR" ] && {
     return 0
   }