diff --git a/cgi/cgi b/cgi/cgi
index 825e7f092..2ca864afe 100755
--- a/cgi/cgi
+++ b/cgi/cgi
@@ -63,7 +63,7 @@ else
 	LH_PACKAGES=$(echo "${QUERY_STRING}" | grep -oE '(^|[?&])packages=[-0-9a-zA-Z. _]+' | cut -f 2 -d '=' | head -n1)
 
 	# Advanced bootstrap options
-	LH_ARCHITECTURE=$(echo "${QUERY_STRING}" | grep -oE '(^|[?&])architecture=[0-9,a-z]+' | cut -f 2 -d '=' | head -n1)
+	LH_ARCHITECTURE=$(echo "${QUERY_STRING}" | grep -oE '(^|[?&])architecture=[0-9a-z]+' | cut -f 2 -d '=' | head -n1)
 	LH_BOOTSTRAP_FLAVOUR=$(echo "${QUERY_STRING}" | grep -oE '(^|[?&])bootstrap_flavour=[a-z]+' | cut -f 2 -d '=' | head -n1)
 	LH_MIRROR_BOOTSTRAP=$(echo "${QUERY_STRING}" | grep -oE '(^|[?&])mirror_bootstrap=[0-9,a-z,A-Z,.,~,:,/,_,-]+' | cut -f 2 -d '=' | head -n1)
 	LH_MIRROR_BINARY=$(echo "${QUERY_STRING}" | grep -oE '(^|[?&])mirror_binary=[0-9,a-z,A-Z,.,~,:,/,_,-]+' | cut -f 2 -d '=' | head -n1)