diff --git a/radio/src/definitions.h b/radio/src/definitions.h
index 8b5f5391e..8399656a6 100644
--- a/radio/src/definitions.h
+++ b/radio/src/definitions.h
@@ -67,4 +67,7 @@
   #define CONVERT_UINT_PTR(x) ((uint32_t *)(x))
 #endif
 
+// returns the number of elements of an array
+#define DIM(arr) (sizeof((arr)) / sizeof((arr)[0]))
+
 #endif // _DEFINITIONS_H_
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index e36d5f6a0..99243c1d8 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -634,9 +634,6 @@ void doLoopCommonActions();
 
 #define BITMASK(bit) (1<<(bit))
 
-/// returns the number of elements of an array
-#define DIM(arr) (sizeof((arr))/sizeof((arr)[0]))
-
 template<class t> inline t min(t a, t b) { return a<b?a:b; }
 template<class t> inline t max(t a, t b) { return a>b?a:b; }
 template<class t> inline t sgn(t a) { return a>0 ? 1 : (a < 0 ? -1 : 0); }
diff --git a/radio/src/pulses/modules_helpers.h b/radio/src/pulses/modules_helpers.h
index efda11518..b6c346203 100644
--- a/radio/src/pulses/modules_helpers.h
+++ b/radio/src/pulses/modules_helpers.h
@@ -22,6 +22,7 @@
 #define _MODULES_H_
 
 #include "bitfield.h"
+#include "definitions.h"
 
 #define CROSSFIRE_CHANNELS_COUNT        16