diff --git a/kernel/kernel.c b/kernel/kernel.c
index fb7d84f..0073060 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -175,14 +175,16 @@ int strcasecmp(const char *s1, const char *s2)
     return (int)UPPER(*s1) - (int)UPPER(*s2);
 }
 
-int memcmp(const char *s1, const char *s2, size_t n)
+int memcmp(const void *_s1, const void *_s2, size_t n)
 {
+    unsigned char const *s1 = _s1, *s2 = _s2;
+
     while(n--)
     {
         if(*s1 != *s2)
-            return *s1 - *s2;
-        *s1++;
-        *s2++;
+            return (int)*s1 - (int)*s2;
+        s1++;
+        s2++;
     }
     return 0;
 }
diff --git a/kernel/kernel.h b/kernel/kernel.h
index 2faac3f..2d671f8 100644
--- a/kernel/kernel.h
+++ b/kernel/kernel.h
@@ -85,7 +85,8 @@ void *memset(void *s, int c, size_t n);
 void *memcpy(void *dest, const void *src, size_t n);
 size_t strlen(const char *s);
 int strcasecmp(const char *s1, const char *s2);
-int memcmp(const char *s1, const char *s2, size_t n);
+int memcmp(const void *s1, const void *s2, size_t n);
+
 /* stdarg.h functions */
 typedef void * va_list;
 #define va_start(v,a) v = (void *)((uintptr_t)(&a) + sizeof(a))