diff --git a/libc/arch-x86/string/bzero.S b/libc/arch-x86/string/bzero.S
new file mode 100644
index 0000000..2ec9c7d
--- /dev/null
+++ b/libc/arch-x86/string/bzero.S
@@ -0,0 +1,43 @@
+/*	$OpenBSD: bzero.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Public domain.
+ */
+
+#include <machine/asm.h>
+
+ENTRY(bzero)
+	pushl	%edi
+	movl	8(%esp),%edi
+	movl	12(%esp),%edx
+
+	cld				/* set fill direction forward */
+	xorl	%eax,%eax		/* set fill data to 0 */
+
+	/*
+	 * if the string is too short, it's really not worth the overhead
+	 * of aligning to word boundries, etc.  So we jump to a plain
+	 * unaligned set.
+	 */
+	cmpl	$16,%edx
+	jb	L1
+
+	movl	%edi,%ecx		/* compute misalignment */
+	negl	%ecx
+	andl	$3,%ecx
+	subl	%ecx,%edx
+	rep				/* zero until word aligned */
+	stosb
+
+	movl	%edx,%ecx		/* zero by words */
+	shrl	$2,%ecx
+	andl	$3,%edx
+	rep
+	stosl
+
+L1:	movl	%edx,%ecx		/* zero remainder by bytes */
+	rep
+	stosb
+
+	popl	%edi
+	ret