diff --git a/contrib/mandoc/config.h b/contrib/mandoc/config.h
index 213513f1c87..91957717b3f 100644
--- a/contrib/mandoc/config.h
+++ b/contrib/mandoc/config.h
@@ -13,7 +13,7 @@
 #define HAVE_ENDIAN 0
 #define HAVE_ERR 1
 #define HAVE_FTS 1
-#ifdef __GLIBC__
+#if defined(__GLIBC__) || defined(__APPLE__)
 #define HAVE_FTS_COMPARE_CONST 0
 #else
 #define HAVE_FTS_COMPARE_CONST 1