diff --git a/alpine_install.sh b/alpine_install.sh
index cb22dcf..10abbca 100755
--- a/alpine_install.sh
+++ b/alpine_install.sh
@@ -26,7 +26,7 @@ if [[ ! "$password" ]]; then
     [[ "$password_confirmation" != "$password" ]] && printf "|> error: passwords do not match\n" && exit 1
 fi
 
-[[ "$repository_protocol" ]] && printf "|> setting protocol for all repositories to '"$repository_protocol"'\n" && sed -i "s/http/$repository_protocol/g" "/etc/apk/repositories"
+[[ "$repository_protocol" ]] && printf "|> setting protocol for all repositories to '"$repository_protocol"'\n" && sed -i "s/http:/$repository_protocol:/g" "/etc/apk/repositories"
 [[ "$repository_version" ]] && printf "|> setting version for all repositories to '"$repository_version"'\n" && sed -i "s/\/v.*\//\/$repository_version\//g" "/etc/apk/repositories"
 
 printf "|> updating packages...\n"