diff --git a/src/libratbag-util.c b/src/libratbag-util.c
index 7d3af684..67f11d0a 100644
--- a/src/libratbag-util.c
+++ b/src/libratbag-util.c
@@ -191,7 +191,7 @@ err:
 	return ret;
 }
 
-int mkdir_p(char *dir, mode_t mode)
+int mkdir_p(const char *dir, mode_t mode)
 {
     struct stat sb;
 
diff --git a/src/libratbag-util.h b/src/libratbag-util.h
index 5661c91f..dddfd183 100644
--- a/src/libratbag-util.h
+++ b/src/libratbag-util.h
@@ -64,7 +64,7 @@ int list_empty(const struct list *list);
 	     pos = tmp,							\
 	     tmp = container_of(pos->member.next, tmp, member))
 
-int mkdir_p(char *dir, mode_t mode);
+int mkdir_p(const char *dir, mode_t mode);
 
 static inline char*
 strncpy_safe(char *dest, const char *src, size_t n)