diff --git a/radio/src/pulses/ppm.cpp b/radio/src/pulses/ppm.cpp
index 5fffe279c..ea282bf2e 100644
--- a/radio/src/pulses/ppm.cpp
+++ b/radio/src/pulses/ppm.cpp
@@ -19,6 +19,8 @@
  * GNU General Public License for more details.
  */
 
+#include <climits>
+
 #include "opentx.h"
 
 // Minimum space after the last PPM pulse in us