diff --git a/client/src/cmdlfio.c b/client/src/cmdlfio.c
index e9a0b25ae..421ed6927 100644
--- a/client/src/cmdlfio.c
+++ b/client/src/cmdlfio.c
@@ -169,7 +169,7 @@ static int CmdIOProxDemod(const char *Cmd) {
     calccrc &= 0xff;
     calccrc = 0xff - calccrc;
 
-    char crc_str[30] = {0};
+    char crc_str[36] = {0};
 
     if (crc == calccrc) {
         snprintf(crc_str, sizeof(crc_str), "(" _GREEN_("ok") ")" );