diff --git a/src/encauth/ccm/ccm_memory_ex.c b/src/encauth/ccm/ccm_memory_ex.c
index e2facdb..af44f2f 100644
--- a/src/encauth/ccm/ccm_memory_ex.c
+++ b/src/encauth/ccm/ccm_memory_ex.c
@@ -15,7 +15,7 @@
   CCM support, process a block of memory, Tom St Denis
 */
 
-#ifdef LTC_CCM_MODE
+#if defined LTC_CCM_MODE && 0
 
 /**
    CCM encrypt/decrypt and produce an authentication tag