diff --git a/scripts/_common.sh b/scripts/_common.sh
index 76f3cfc..ce2404a 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -15,15 +15,15 @@ pkg_dependencies="postgresql postgresql-contrib"
 # ($YNH_ARCH returns armhf for both...)
 detect_arch(){
 	local architecture
-	if [ -n "$(uname -m | grep [arm64,aarch64]; then
+	if uname -m | grep -q "[arm64,aarch64]" ; then
 		architecture="arm64"
-	elif [ -n "$(uname -m | grep 64)" ]; then
+	elif uname -m | grep -q "64" ; then
 		architecture="x86-64"
-	elif [ -n "$(uname -m | grep 86)" ]; then
+	elif uname -m | grep -q "86" ; then
 		architecture="i386"
-	elif [ -n "$(uname -m | grep armv6)" ]; then
+	elif uname -m | grep -q "armv6" ; then
 		architecture="armv6"
-	elif [ -n "$(uname -m | grep armv7)" ]; then
+	elif uname -m | grep -q "armv7" ; then
 		architecture="armv7"
 	else
 		architecture="unknown"