diff --git a/lib/libc/stdlib/tdelete.c b/lib/libc/stdlib/tdelete.c
index d3d6e7e88d38..c83afb8cf3f1 100644
--- a/lib/libc/stdlib/tdelete.c
+++ b/lib/libc/stdlib/tdelete.c
@@ -19,7 +19,6 @@ __RCSID("$NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
 #endif
 __FBSDID("$FreeBSD$");
 
-#include <assert.h>
 #define _SEARCH_PRIVATE
 #include <search.h>
 #include <stdlib.h>
diff --git a/lib/libc/stdlib/tfind.c b/lib/libc/stdlib/tfind.c
index 680ff327bcdd..c5d66cf41612 100644
--- a/lib/libc/stdlib/tfind.c
+++ b/lib/libc/stdlib/tfind.c
@@ -19,7 +19,6 @@ __RCSID("$NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
 #endif
 __FBSDID("$FreeBSD$");
 
-#include <assert.h>
 #define _SEARCH_PRIVATE
 #include <stdlib.h>
 #include <search.h>
diff --git a/lib/libc/stdlib/tsearch.c b/lib/libc/stdlib/tsearch.c
index 5d859313637c..149c2bb00f16 100644
--- a/lib/libc/stdlib/tsearch.c
+++ b/lib/libc/stdlib/tsearch.c
@@ -19,7 +19,6 @@ __RCSID("$NetBSD: tsearch.c,v 1.3 1999/09/16 11:45:37 lukem Exp $");
 #endif
 __FBSDID("$FreeBSD$");
 
-#include <assert.h>
 #define _SEARCH_PRIVATE
 #include <search.h>
 #include <stdlib.h>
diff --git a/lib/libc/stdlib/twalk.c b/lib/libc/stdlib/twalk.c
index 49f474e6ae48..55f220f38750 100644
--- a/lib/libc/stdlib/twalk.c
+++ b/lib/libc/stdlib/twalk.c
@@ -19,7 +19,6 @@ __RCSID("$NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $");
 #endif
 __FBSDID("$FreeBSD$");
 
-#include <assert.h>
 #define _SEARCH_PRIVATE
 #include <search.h>
 #include <stdlib.h>