diff --git a/src/font.c b/src/font.c
index 736df67..c43fc8b 100644
--- a/src/font.c
+++ b/src/font.c
@@ -7,8 +7,8 @@
 void *fontdb;
 
 int font_compare(const void *a, const void *b) {
-	font_t *x = (font_t *)a;
-	font_t *y = (font_t *)b;
+	const font_t *x = (const font_t *)a;
+	const font_t *y = (const font_t *)b;
 
 	return strcmp(x->name, y->name);
 }