diff --git a/src/app-layer-modbus.c b/src/app-layer-modbus.c
index 9a70f4a5a3..79903c4c7d 100644
--- a/src/app-layer-modbus.c
+++ b/src/app-layer-modbus.c
@@ -280,7 +280,7 @@ static void ModbusSetTxDetectFlags(void *vtx, uint8_t dir, uint64_t flags)
     if (dir & STREAM_TOSERVER) {
         tx->detect_flags_ts = flags;
     } else {
-        tx->detect_flags_ts = flags;
+        tx->detect_flags_tc = flags;
     }
 }