diff --git a/libc/stdlib/assert.c b/libc/stdlib/assert.c
new file mode 100644
index 0000000..b439d8e
--- /dev/null
+++ b/libc/stdlib/assert.c
@@ -0,0 +1,54 @@
+/*	$OpenBSD: assert.c,v 1.8 2005/08/08 08:05:33 espie Exp $ */
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void
+__assert(const char *file, int line, const char *failedexpr)
+{
+	(void)fprintf(stderr,
+	    "assertion \"%s\" failed: file \"%s\", line %d\n",
+	    failedexpr, file, line);
+	abort();
+	/* NOTREACHED */
+}
+
+void
+__assert2(const char *file, int line, const char *func, const char *failedexpr)
+{
+	(void)fprintf(stderr,
+	    "assertion \"%s\" failed: file \"%s\", line %d, function \"%s\"\n",
+	    failedexpr, file, line, func);
+  abort();
+	/* NOTREACHED */
+}