diff --git a/src/open9x.cpp b/src/open9x.cpp
index 4cb7b7bc1..b35a1648b 100644
--- a/src/open9x.cpp
+++ b/src/open9x.cpp
@@ -1168,7 +1168,7 @@ int16_t getGVarValue(int16_t x, int16_t min, int16_t max, int8_t phase)
   return limit(min, x, max);
 }
 
-void setGVarValue(uint8_t idx, int8_t value, int8_t phase)
+void setGVarValue(uint8_t idx, int16_t value, int8_t phase)
 {
   phase = getGVarFlightPhase(phase, idx);
   if (GVAR_VALUE(idx, phase) != value) {
diff --git a/src/open9x.h b/src/open9x.h
index c36d4887a..958fffd93 100644
--- a/src/open9x.h
+++ b/src/open9x.h
@@ -747,7 +747,7 @@ extern void setTrimValue(uint8_t phase, uint8_t idx, int16_t trim);
   #else
     uint8_t getGVarFlightPhase(uint8_t phase, uint8_t idx);
     int16_t getGVarValue(int16_t x, int16_t min, int16_t max, int8_t phase);
-    void setGVarValue(uint8_t x, int8_t value, int8_t phase);
+    void setGVarValue(uint8_t x, int16_t value, int8_t phase);
     #define GET_GVAR(x, min, max, p) getGVarValue(x, min, max, p)
     #define SET_GVAR(idx, val, p) setGVarValue(idx, val, p)
   #endif