diff --git a/library/ccm.c b/library/ccm.c
index 87f1886..e397e0a 100644
--- a/library/ccm.c
+++ b/library/ccm.c
@@ -78,6 +78,8 @@
     if( cipher_info->block_size != 16 )
         return( POLARSSL_ERR_CCM_BAD_INPUT );
 
+    cipher_free( &ctx->cipher_ctx );
+
     if( ( ret = cipher_init_ctx( &ctx->cipher_ctx, cipher_info ) ) != 0 )
         return( ret );