diff --git a/library/debug.c b/library/debug.c
index 0c46c06..1f7c2a0 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -44,6 +44,8 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "mbedtls/error.h"
+
 #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
     !defined(inline) && !defined(__cplusplus)
 #define inline __inline
@@ -85,7 +87,7 @@
 {
     va_list argp;
     char str[DEBUG_BUF_SIZE];
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
     if( NULL == ssl              ||
         NULL == ssl->conf        ||