diff --git a/src/modules/LR11x0/LR11x0.cpp b/src/modules/LR11x0/LR11x0.cpp
index 501594c5..b075b1f1 100644
--- a/src/modules/LR11x0/LR11x0.cpp
+++ b/src/modules/LR11x0/LR11x0.cpp
@@ -4,6 +4,7 @@
 #include "../../utils/Cryptography.h"
 
 #include <string.h>
+#include <math.h>
 
 #if !RADIOLIB_EXCLUDE_LR11X0