1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/include/diacritic.h b/firmware/include/diacritic.h
index ebcb3bb79a..5bc275ab9b 100644
--- a/firmware/include/diacritic.h
+++ b/firmware/include/diacritic.h
@@ -22,5 +22,5 @@
 #define _DIACRITIC_H_
 #include "system.h"
 
-int is_diacritic(unsigned short char_code, bool *is_rtl);
+int is_diacritic(const unsigned short char_code, bool *is_rtl);
 #endif