diff --git a/ChangeLog.md b/ChangeLog.md
index f894bc5..575e961 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -8,6 +8,8 @@
   * fix for A/B partition scheme support
 * Uninstaller
   * fix for A/B partition scheme support
+* CommonInstaller
+  * fix upgrade-detection for System Mode
 * NanoDroid-Upgrade (nanodroid-upd)
   * improve check for proper wget implementation
 
diff --git a/CommonInstaller b/CommonInstaller
index ee9fcfd..992d52c 100644
--- a/CommonInstaller
+++ b/CommonInstaller
@@ -254,7 +254,7 @@ detect_mode () {
 	ui_print "${MODE_TEXT}"
 	ui_print " "
 
-	if [ "${MODE}" = "SYSTEM"]; then
+	if [ "${MODE}" = "SYSTEM" ]; then
 		if test -f /data/adb/.nanodroid-list -o \
 			-f /data/adb/.nanomod-list -o \
 			-f /system/.nanomod-list -o \