diff --git a/contrib/tracing/mempool_monitor.py b/contrib/tracing/mempool_monitor.py
index ddba9d041ff..c5f672fb954 100755
--- a/contrib/tracing/mempool_monitor.py
+++ b/contrib/tracing/mempool_monitor.py
@@ -17,9 +17,9 @@ from bcc import BPF, USDT
 PROGRAM = """
 # include <uapi/linux/ptrace.h>
 
-// The longest rejection reason is 118 chars and is generated in case of SCRIPT_ERR_EVAL_FALSE by
+// The longest rejection reason is 114 chars and is generated in case of SCRIPT_ERR_EVAL_FALSE by
 // strprintf("block-script-verify-flag-failed (%s)", ScriptErrorString(check.GetScriptError()))
-#define MAX_REJECT_REASON_LENGTH        118
+#define MAX_REJECT_REASON_LENGTH        114
 // The longest string returned by RemovalReasonToString() is 'sizelimit'
 #define MAX_REMOVAL_REASON_LENGTH       9
 #define HASH_LENGTH                     32