diff --git a/companion/src/firmwares/opentx/opentxeeprom.cpp b/companion/src/firmwares/opentx/opentxeeprom.cpp
index b03e746cb..33d5d92e7 100644
--- a/companion/src/firmwares/opentx/opentxeeprom.cpp
+++ b/companion/src/firmwares/opentx/opentxeeprom.cpp
@@ -248,7 +248,7 @@ class SourcesConversionTable: public ConversionTable {
         addConversion(RawSource(SOURCE_TYPE_SPECIAL, 2), val++); // Timer1
         addConversion(RawSource(SOURCE_TYPE_SPECIAL, 3), val++); // Timer2
         addConversion(RawSource(SOURCE_TYPE_SPECIAL, 4), val++); // Timer3
-        for (unsigned i=0; i<MAX_TELEMETRY_SENSORS(board, version)*3; ++i) {
+        for (int i=0; i<MAX_TELEMETRY_SENSORS(board, version)*3; ++i) {
           addConversion(RawSource(SOURCE_TYPE_TELEMETRY, i), val++);
         }
       }