diff --git a/tests/data/multiboot/libc.c b/tests/data/multiboot/libc.c
index 6df9bda..43502f5 100644
--- a/tests/data/multiboot/libc.c
+++ b/tests/data/multiboot/libc.c
@@ -34,6 +34,16 @@ void* memcpy(void *dest, const void *src, int n)
     return dest;
 }
 
+void* memset(void *b, int c, unsigned len)
+{
+	char *bb;
+
+        for (bb = (char *)b; len--; )
+                *bb++ = c;
+
+	return (b);
+}
+
 static void print_char(char c)
 {
     outb(0xe9, c);
diff --git a/tests/data/multiboot/libc.h b/tests/data/multiboot/libc.h
index 04c9922..b16cf64 100644
--- a/tests/data/multiboot/libc.h
+++ b/tests/data/multiboot/libc.h
@@ -58,5 +58,6 @@ static inline void outb(uint16_t port, uint8_t data)
 
 void printf(const char *fmt, ...);
 void* memcpy(void *dest, const void *src, int n);
+void* memset(void *b, int c, unsigned len);
 
 #endif