diff --git a/Applet/src/com/android/javacard/keymaster/KMKeymasterApplet.java b/Applet/src/com/android/javacard/keymaster/KMKeymasterApplet.java
index c9347864..b43abdbb 100644
--- a/Applet/src/com/android/javacard/keymaster/KMKeymasterApplet.java
+++ b/Applet/src/com/android/javacard/keymaster/KMKeymasterApplet.java
@@ -2509,6 +2509,8 @@ private void authorizePadding(KMOperationState op) {
               KMException.throwIt(KMError.UNSUPPORTED_MGF_DIGEST);
             }
             op.setMgfDigest((byte) mgfDigest);
+          } else {
+            op.setMgfDigest(KMType.SHA1);
           }
         }
         op.setPadding((byte) param);