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diff --git a/kitten/arch/x86_64/lib/memset.c b/kitten/arch/x86_64/lib/memset.c
new file mode 100644
index 0000000..26de799
--- /dev/null
+++ b/kitten/arch/x86_64/lib/memset.c
@@ -0,0 +1,14 @@
+/* Normally compiler builtins are used, but sometimes the compiler calls out
+   of line code. Based on asm-i386/string.h.
+ */
+#define _STRING_C
+#include <lwk/string.h>
+
+#undef memset
+void *memset(void *dest, int c, size_t count)
+{
+	char *p = (char *) dest + count;
+	while (count--)
+		*--p = c;
+	return dest;
+}