diff --git a/radio/src/simu.cpp b/radio/src/simu.cpp
index eb8681e39..19b822b26 100644
--- a/radio/src/simu.cpp
+++ b/radio/src/simu.cpp
@@ -296,7 +296,7 @@ void OpenTxSim::updateKeysAndSwitches(bool start)
   static FXuint trimKeys[] = { KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12 };
 #endif
 
-  for (unsigned i=0; i<DIM(trimKeys); i++) {
+  for (unsigned i=0; i<2*NUM_TRIMS; i++) {
     simuSetTrim(i, getApp()->getKeyState(trimKeys[i]));
   }