diff --git a/services/java/com/android/server/MountService.java b/services/java/com/android/server/MountService.java
index d3b338cd63459..7870b06013fe7 100644
--- a/services/java/com/android/server/MountService.java
+++ b/services/java/com/android/server/MountService.java
@@ -1981,7 +1981,8 @@ class MountService extends IMountService.Stub
                 }
 
                 rc = StorageResultCode.OperationSucceeded;
-                String cmd = String.format("obb mount %s %s %d", mObbState.filename, mKey,
+                String cmd = String.format("obb mount %s %s %d", mObbState.filename,
+                        mKey != null ? mKey : "none",
                         mObbState.callerUid);
                 try {
                     mConnector.doCommand(cmd);
diff --git a/tools/obbtool/mkobb.sh b/tools/obbtool/mkobb.sh
index 1987696d0bb2f..ba5256f77dd7a 100755
--- a/tools/obbtool/mkobb.sh
+++ b/tools/obbtool/mkobb.sh
@@ -161,11 +161,10 @@ eval set -- "$args"
 
 while true; do \
     case "$1" in
-        -c) use_crypto=1; shift;;
         -d) directory=$2; shift 2;;
         -h) usage; exit 1;;
-        -k) key=$2; shift 2;;
-        -K) prompt_key=1; shift;;
+        -k) key=$2; use_crypto=1; shift 2;;
+        -K) prompt_key=1; use_crypto=1; shift;;
         -v) verbose=1; shift;;
         -o) filename=$2; shift 2;;
         --) shift; break;;