diff --git a/companion/src/firmwares/er9x/er9xinterface.h b/companion/src/firmwares/er9x/er9xinterface.h
index 639f2c461..469ad9cd0 100644
--- a/companion/src/firmwares/er9x/er9xinterface.h
+++ b/companion/src/firmwares/er9x/er9xinterface.h
@@ -43,7 +43,7 @@ class Er9xInterface : public EEPROMInterface
 
     virtual unsigned long loadxml(RadioData &radioData, QDomDocument &doc);
 
-    virtual int save(uint8_t * eeprom, RadioData & radioData, uint8_t version=0, uint32_t variant=0)
+    virtual int save(uint8_t * eeprom, const RadioData & radioData, uint8_t version=0, uint32_t variant=0)
     {
       return 0;
     }
diff --git a/companion/src/firmwares/ersky9x/ersky9xinterface.h b/companion/src/firmwares/ersky9x/ersky9xinterface.h
index 3ebe36128..6d815190f 100644
--- a/companion/src/firmwares/ersky9x/ersky9xinterface.h
+++ b/companion/src/firmwares/ersky9x/ersky9xinterface.h
@@ -42,7 +42,7 @@ class Ersky9xInterface : public EEPROMInterface
 
     virtual unsigned long loadBackup(RadioData &, const uint8_t * eeprom, int esize, int index);
     
-    virtual int save(uint8_t * eeprom, RadioData & radioData, uint8_t version=0, uint32_t variant=0)
+    virtual int save(uint8_t * eeprom, const RadioData & radioData, uint8_t version=0, uint32_t variant=0)
     {
       return 0;
     }