diff --git a/src/app-layer-modbus.h b/src/app-layer-modbus.h
index fba43db74a..99e07e885f 100644
--- a/src/app-layer-modbus.h
+++ b/src/app-layer-modbus.h
@@ -88,6 +88,8 @@ typedef struct ModbusTransaction_ {
     uint8_t     function;
     uint8_t     category;
     uint8_t     type;
+    uint8_t     replied;                    /**< bool indicating request is replied to. */
+
     union {
         uint16_t    subFunction;
         uint8_t     mei;
@@ -107,8 +109,6 @@ typedef struct ModbusTransaction_ {
 
     AppLayerDecoderEvents *decoder_events;  /**< per tx events */
 
-    uint8_t     replied;                    /**< bool indicating request is replied to. */
-
     TAILQ_ENTRY(ModbusTransaction_) next;
 } ModbusTransaction;