diff --git a/radio/src/gui/128x64/model_module_options.cpp b/radio/src/gui/128x64/model_module_options.cpp
index 78abfa28e..10e6e4a1d 100644
--- a/radio/src/gui/128x64/model_module_options.cpp
+++ b/radio/src/gui/128x64/model_module_options.cpp
@@ -19,6 +19,7 @@
  */
 
 #include <opentx.h>
+#include <math.h>
 
 #define RECEIVER_OPTIONS_2ND_COLUMN  (11*FW)