diff --git a/companion/src/eeprominterface.cpp b/companion/src/eeprominterface.cpp
index 069de327b..8ff58eb7b 100644
--- a/companion/src/eeprominterface.cpp
+++ b/companion/src/eeprominterface.cpp
@@ -1765,6 +1765,33 @@ QString getBoardName(BoardEnum board)
   }
 }
 
+const int Firmware::getFlashSize()
+{
+  switch (board) {
+    case BOARD_STOCK:
+      return FSIZE_STOCK;
+    case BOARD_M128:
+      return FSIZE_M128;
+    case BOARD_MEGA2560:
+    case BOARD_GRUVIN9X:
+      return FSIZE_GRUVIN9X;
+    case BOARD_SKY9X:
+      return FSIZE_SKY9X;
+    case BOARD_9XRPRO:
+    case BOARD_AR9X:
+      return FSIZE_9XRPRO;
+    case BOARD_TARANIS:
+    case BOARD_TARANIS_PLUS:
+    case BOARD_TARANIS_X9E:
+    case BOARD_FLAMENCO:
+      return FSIZE_TARANIS;
+    case BOARD_HORUS:
+      return FSIZE_HORUS;
+    default:
+      return 0;
+  }
+}
+
 Firmware * GetFirmware(QString id)
 {
   foreach(Firmware * firmware, firmwares) {
diff --git a/companion/src/eeprominterface.h b/companion/src/eeprominterface.h
index 4baf3e596..1adf9cf8e 100644
--- a/companion/src/eeprominterface.h
+++ b/companion/src/eeprominterface.h
@@ -37,6 +37,15 @@
 #define EESIZE_9XRPRO          (128*4096)
 #define EESIZE_MAX             EESIZE_9XRPRO
 
+#define FSIZE_STOCK            (64*1024)
+#define FSIZE_M128             (128*1024)
+#define FSIZE_GRUVIN9X         (256*1024)
+#define FSIZE_TARANIS          (512*1024)
+#define FSIZE_SKY9X            (256*1024)
+#define FSIZE_9XRPRO           (512*1024)
+#define FSIZE_HORUS            (2048*1024)
+#define FSIZE_MAX              FSIZE_HORUS
+
 QString getBoardName(BoardEnum board);
 
 #define IS_9X(board)           (board==BOARD_STOCK || board==BOARD_M128)
@@ -1671,6 +1680,8 @@ class Firmware {
     virtual bool isTelemetrySourceAvailable(int source) = 0;
 
     virtual int isAvailable(PulsesProtocol proto, int port=0) = 0;
+    
+    const int getFlashSize();
 
   public:
     QList<const char *> languages;
diff --git a/companion/src/firmwareinterface.cpp b/companion/src/firmwareinterface.cpp
index 889cd427a..209b3e92c 100644
--- a/companion/src/firmwareinterface.cpp
+++ b/companion/src/firmwareinterface.cpp
@@ -44,7 +44,7 @@ int getFileType(const QString &fullFileName)
 }
 
 FirmwareInterface::FirmwareInterface(const QString &filename):
-  flash(MAX_FSIZE, 0),
+  flash(FSIZE_MAX, 0),
   flashSize(0),
   versionId(0),
   eepromVersion(0),
@@ -59,11 +59,11 @@ FirmwareInterface::FirmwareInterface(const QString &filename):
     QFile file(filename);
     if (file.open(QIODevice::ReadOnly | QIODevice::Text)) { // reading HEX TEXT file
       QTextStream inputStream(&file);
-      flashSize = HexInterface(inputStream).load((uint8_t *)flash.data(), MAX_FSIZE);
+      flashSize = HexInterface(inputStream).load((uint8_t *)flash.data(), FSIZE_MAX);
       file.close();
       if (flashSize == 0) {
         file.open(QIODevice::ReadOnly);
-        flashSize = file.read((char *)flash.data(), MAX_FSIZE);
+        flashSize = file.read((char *)flash.data(), FSIZE_MAX);
       }
     }
   }
@@ -342,7 +342,7 @@ bool FirmwareInterface::isValid()
 
 unsigned int FirmwareInterface::save(QString fileName)
 {
-  uint8_t binflash[MAX_FSIZE];
+  uint8_t binflash[FSIZE_MAX];
   memcpy(&binflash, flash.constData(), flashSize);
   QFile file(fileName);
   
diff --git a/companion/src/firmwareinterface.h b/companion/src/firmwareinterface.h
index ae7ffb1e6..0171d91ea 100644
--- a/companion/src/firmwareinterface.h
+++ b/companion/src/firmwareinterface.h
@@ -19,7 +19,6 @@
 #include <QImage>
 #include <QByteArray>
 
-#define MAX_FSIZE (2048*1024)
 #define SPLASH_WIDTH (128)
 #define SPLASH_HEIGHT (64)
 #define SPLASHX9D_WIDTH (212)
diff --git a/companion/src/radiointerface.cpp b/companion/src/radiointerface.cpp
index df5e0a427..efc0b3e57 100644
--- a/companion/src/radiointerface.cpp
+++ b/companion/src/radiointerface.cpp
@@ -66,10 +66,7 @@ QStringList getDfuArgs(const QString & cmd, const QString & filename)
   burnConfigDialog bcd;
   QString memory = "0x08000000";
   if (cmd == "-U") {
-    if(GetCurrentFirmware()->getBoard() == BOARD_HORUS)
-      memory.append(QString(":%1").arg(MAX_FSIZE));
-    else 
-      memory.append(QString(":%1").arg(512*1024));
+    memory.append(QString(":%1").arg(GetCurrentFirmware()->getFlashSize()));
   }
   args << bcd.getDFUArgs();
   if (!filename.endsWith(".dfu")) {