diff --git a/bluetooth_firmware.sh b/bluetooth_firmware.sh
index dc9ef66..2b25e96 100755
--- a/bluetooth_firmware.sh
+++ b/bluetooth_firmware.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-FIRM=`cat /proc/driver/brcmf_fw`
+FIRM=$(cat /proc/driver/brcmf_fw)
 
 if [[ $FIRM =~ .*a0.* ]]
 then