diff --git a/install b/install
index 8d4ec1f..4abc982 100755
--- a/install
+++ b/install
@@ -13,7 +13,7 @@
 # https://github.com/armbian/config/blob/master/debian-software
 # https://forum.openmediavault.org/index.php/Thread/25062-Install-OMV5-on-Debian-10-Buster/
 #
-# version: 1.3.3
+# version: 1.3.4
 #
 
 if [[ $(id -u) -ne 0 ]]; then
@@ -162,7 +162,7 @@ fi
 
 # Add Debian signing keys to raspbian to prevent apt-get update failures
 # when OMV adds security and/or backports repos
-if grep -q raspberrypi.org /etc/apt/sources.list.d/*; then
+if grep -rq raspberrypi.org /etc/apt/*; then
   echo "Adding Debian signing keys..."
   for key in AA8E81B4331F7F50 112695A0E562B32A 04EE7237B7D453EC 648ACFD622F3D138; do
     apt-key adv --no-tty --keyserver ${keyserver} --recv-keys "${key}"