diff --git a/lib/advanced_C_standard_liberary/include/acl/file.h b/lib/advanced_C_standard_liberary/include/acl/file.h
index 710a4ed..a4ab280 100644
--- a/lib/advanced_C_standard_liberary/include/acl/file.h
+++ b/lib/advanced_C_standard_liberary/include/acl/file.h
@@ -1,5 +1,5 @@
 #ifndef acl_file_h
 #define acl_file_h
 #include <stdbool.h>
-char* acl_ReadTextFile(char *filePath, bool *sucess);
+char* acl_ReadTextFile(const char *filePath, bool *sucess);
 #endif