diff --git a/radio/src/mixer.cpp b/radio/src/mixer.cpp
index 1d06d2d25..03afc1790 100755
--- a/radio/src/mixer.cpp
+++ b/radio/src/mixer.cpp
@@ -753,9 +753,11 @@ void evalFlightModeMixes(uint8_t mode, uint8_t tick10ms)
               if (mix_trim == THR_STICK) {
                 if (g_model.thrTrim) {
                   if (g_model.throttleReversed) {
-                    trim = -trim;
+                    trim = ((int32_t)(trim+TRIM_MIN) * (RESX-v)) >> (RESX_SHIFT+1);
+                  }
+                  else {
+                    trim = ((int32_t)(trim-TRIM_MIN) * (RESX-v)) >> (RESX_SHIFT+1);
                   }
-                  trim = ((trim-2*TRIM_MIN) * (RESX-v)) >> (RESX_SHIFT+1);
                 }
                 if (g_model.throttleReversed) {
                   trim = -trim;
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index c603d3396..33b96d8be 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -1661,11 +1661,7 @@ FORCEINLINE void evalTrims()
     int16_t trim = getTrimValue(phase, i);
 #if !defined(PCBTARANIS)
     if (i==THR_STICK && g_model.thrTrim) {
-      if (g_model.throttleReversed)
-        trim = -trim;
-      int16_t v = anas[i];
-      int32_t vv = ((int32_t)trim-TRIM_MIN)*(RESX-v)>>(RESX_SHIFT+1);
-      trim = vv;
+      trim = (((g_model.throttleReversed)?(int32_t)(trim+TRIM_MIN):(int32_t)(trim-TRIM_MIN)) * (RESX-getValue(MIXSRC_Thr))) >> (RESX_SHIFT+1);
     }
 #endif
     if (trimsCheckTimer > 0) {