diff --git a/postinstall.sh b/postinstall.sh
index 4f6f94e..b37be50 100755
--- a/postinstall.sh
+++ b/postinstall.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-if [ $(uname -m) == "x86_64" ]; then
+if [ "$(uname -m)" = "x86_64" ]; then
   echo "Not running on RPi - Skipping postinstall"
   exit 0
 fi