diff --git a/core/src/main/java/org/bouncycastle/crypto/modes/KGCMBlockCipher.java b/core/src/main/java/org/bouncycastle/crypto/modes/KGCMBlockCipher.java
index d0483a2bce..318b73516f 100755
--- a/core/src/main/java/org/bouncycastle/crypto/modes/KGCMBlockCipher.java
+++ b/core/src/main/java/org/bouncycastle/crypto/modes/KGCMBlockCipher.java
@@ -99,6 +99,7 @@ public void init(boolean forEncryption, CipherParameters params)
 
             newNonce = aeadParameters.getNonce();
             initialAssociatedText = aeadParameters.getAssociatedText();
+			associatedText.reset();
             macSize = macSizeInBits / 8;
             keyParameter = aeadParameters.getKey();
 
@@ -113,6 +114,7 @@ else if (params instanceof ParametersWithIV)
 
             newNonce = withIV.getIV();
             initialAssociatedText = null;
+			associatedText.reset();
             macSize = blockSize; // Set default mac size
 
             CipherParameters innerParameters = withIV.getParameters();