diff --git a/src/main/drivers/transponder_ir.c b/src/main/drivers/transponder_ir.c
index 792e26beff..626c60097c 100644
--- a/src/main/drivers/transponder_ir.c
+++ b/src/main/drivers/transponder_ir.c
@@ -17,6 +17,7 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
 
 #include <platform.h>