diff --git a/services/core/java/com/android/server/power/PowerManagerService.java b/services/core/java/com/android/server/power/PowerManagerService.java
index db69158e63c16..49d05e0d1cfdf 100644
--- a/services/core/java/com/android/server/power/PowerManagerService.java
+++ b/services/core/java/com/android/server/power/PowerManagerService.java
@@ -4087,7 +4087,10 @@ public final class PowerManagerService extends SystemService
         if (sQuiescent) {
             // Pass the optional "quiescent" argument to the bootloader to let it know
             // that it should not turn the screen/lights on.
-            reason = reason + ",quiescent";
+            if (reason != ""){
+                reason += ",";
+            }
+            reason = reason + "quiescent";
         }
 
         SystemProperties.set("sys.powerctl", "reboot," + reason);