diff --git a/source/backend/engine/CarlaEngineBridge.cpp b/source/backend/engine/CarlaEngineBridge.cpp
index be3a87ac7..7ae1b3886 100644
--- a/source/backend/engine/CarlaEngineBridge.cpp
+++ b/source/backend/engine/CarlaEngineBridge.cpp
@@ -1186,7 +1186,7 @@ protected:
                     }
 
                     uint8_t* midiData(fShmRtClientControl.data->midiOut);
-                    carla_zeroBytes(midiData, kBridgeRtClientDataMidiOutSize);
+                    carla_zeroBytes(midiData, kBridgeBaseMidiOutHeaderSize);
                     std::size_t curMidiDataPos = 0;
 
                     if (pData->events.in[0].type != kEngineEventTypeNull)
@@ -1208,7 +1208,7 @@ protected:
                                 event.ctrl.convertToMidiData(event.channel, size, data);
                                 CARLA_SAFE_ASSERT_CONTINUE(size > 0 && size <= 3);
 
-                                if (curMidiDataPos + 6U /* time, port and size */ + size >= kBridgeRtClientDataMidiOutSize)
+                                if (curMidiDataPos + kBridgeBaseMidiOutHeaderSize + size >= kBridgeRtClientDataMidiOutSize)
                                     break;
 
                                 // set time
@@ -1225,13 +1225,13 @@ protected:
                                 for (uint8_t j=0; j<size; ++j)
                                     *midiData++ = data[j];
 
-                                curMidiDataPos += 6U /* time, port and size */ + size;
+                                curMidiDataPos += kBridgeBaseMidiOutHeaderSize + size;
                             }
                             else if (event.type == kEngineEventTypeMidi)
                             {
                                 const EngineMidiEvent& _midiEvent(event.midi);
 
-                                if (curMidiDataPos + 6U /* time, port and size */ + _midiEvent.size >= kBridgeRtClientDataMidiOutSize)
+                                if (curMidiDataPos + kBridgeBaseMidiOutHeaderSize + _midiEvent.size >= kBridgeRtClientDataMidiOutSize)
                                     break;
 
                                 const uint8_t* const _midiData(_midiEvent.dataExt != nullptr ? _midiEvent.dataExt : _midiEvent.data);
@@ -1252,7 +1252,7 @@ protected:
                                 for (uint8_t j=1; j<_midiEvent.size; ++j)
                                     *midiData++ = _midiData[j];
 
-                                curMidiDataPos += 6U /* time, port and size */ + _midiEvent.size;
+                                curMidiDataPos += kBridgeBaseMidiOutHeaderSize + _midiEvent.size;
                             }
                         }
 
diff --git a/source/libjack/libjack.cpp b/source/libjack/libjack.cpp
index 20c32ffc9..4bfe50036 100644
--- a/source/libjack/libjack.cpp
+++ b/source/libjack/libjack.cpp
@@ -746,7 +746,7 @@ bool CarlaJackAppClient::handleRtData()
                 if (fServer.numMidiOuts > 0)
                 {
                     uint8_t* midiData(fShmRtClientControl.data->midiOut);
-                    carla_zeroBytes(midiData, kBridgeRtClientDataMidiOutSize);
+                    carla_zeroBytes(midiData, kBridgeBaseMidiOutHeaderSize);
                     std::size_t curMidiDataPos = 0;
 
                     for (uint8_t i=0; i<fServer.numMidiOuts; ++i)
@@ -757,7 +757,7 @@ bool CarlaJackAppClient::handleRtData()
                         {
                             jack_midi_event_t& jmevent(midiPortBuf.events[j]);
 
-                            if (curMidiDataPos + 6U /* time, port and size */ + jmevent.size >= kBridgeRtClientDataMidiOutSize)
+                            if (curMidiDataPos + kBridgeBaseMidiOutHeaderSize + jmevent.size >= kBridgeRtClientDataMidiOutSize)
                                 break;
 
                             // set time
@@ -774,7 +774,7 @@ bool CarlaJackAppClient::handleRtData()
                             std::memcpy(midiData, jmevent.buffer, jmevent.size);
                             midiData += jmevent.size;
 
-                            curMidiDataPos += 6U /* time, port and size */ + jmevent.size;
+                            curMidiDataPos += kBridgeBaseMidiOutHeaderSize + jmevent.size;
                         }
                     }
                 }
diff --git a/source/utils/CarlaBridgeDefines.hpp b/source/utils/CarlaBridgeDefines.hpp
index ecfe971a5..93fd1f416 100644
--- a/source/utils/CarlaBridgeDefines.hpp
+++ b/source/utils/CarlaBridgeDefines.hpp
@@ -139,6 +139,7 @@ struct BridgeTimeInfo {
 // -------------------------------------------------------------------------------------------------------------------
 
 static const std::size_t kBridgeRtClientDataMidiOutSize = 511*4;
+static const std::size_t kBridgeBaseMidiOutHeaderSize   = 6U /* time, port and size */;
 
 // Server => Client RT
 struct BridgeRtClientData {