diff --git a/reactos/lib/crtdll/string/memccpy.c b/reactos/lib/crtdll/string/memccpy.c
index eda7e7ddc4b..ba13fa44cb3 100644
--- a/reactos/lib/crtdll/string/memccpy.c
+++ b/reactos/lib/crtdll/string/memccpy.c
@@ -6,4 +6,4 @@ _memccpy (void *to, const void *from,int c,size_t count)
 {
 	memcpy(to,from,count);
 	return memchr(to,c,count);
-}
\ No newline at end of file
+}
diff --git a/reactos/lib/crtdll/string/memcpy.c b/reactos/lib/crtdll/string/memcpy.c
index 609afd4b5df..7a1f7f45912 100644
--- a/reactos/lib/crtdll/string/memcpy.c
+++ b/reactos/lib/crtdll/string/memcpy.c
@@ -1,15 +1,12 @@
-typedef  unsigned int size_t;
-
-void *
-memcpy (char *to, char *from, size_t count);
+#include <crtdll/string.h>
 
 /* This is the most reliable way to avoid incompatibilities
    in available built-in functions on various systems.  */
 void *
-memcpy (char *to, char *from, size_t count)
+memcpy (void *to, const void *from, size_t count)
 {
-  register char *f = from;
-  register char *t = to;
+  register char *f = (char *)from;
+  register char *t = (char *)to;
   register int i = count;
 
   while (i-- > 0)
@@ -17,15 +14,3 @@ memcpy (char *to, char *from, size_t count)
 
   return to;
 }
-
-void *__constant_memcpy(char *to, char *from, size_t count)
-{
-	return memcpy(to,from,count);
-}
-
-void *__memcpy(char *to, char *from, size_t count)
-{
-	return memcpy(to,from,count);
-}
-
-
diff --git a/reactos/lib/crtdll/string/memset.c b/reactos/lib/crtdll/string/memset.c
index ef1069df3ae..286ff5d7bd4 100644
--- a/reactos/lib/crtdll/string/memset.c
+++ b/reactos/lib/crtdll/string/memset.c
@@ -1,8 +1,8 @@
-typedef int size_t;
+#include <crtdll/string.h>
 
 void * memset(void *src,int val,size_t count)
 {
-	char *char_src = src;
+	char *char_src = (char *)src;
 
 	while(count>0) {
 		*char_src = val;
@@ -11,19 +11,3 @@ void * memset(void *src,int val,size_t count)
 	}
 	return src;
 }
-
-void *__memset_generic(void *src,int val,size_t count)
-{
-	return memset(src,val,count);
-}
-
-void *  __constant_c_and_count_memset(void *  s, unsigned long pattern, size_t count)
-{
-	return memset(s,pattern,count); 
-}
-  
-
-void * __constant_c_memset(void *src,int val,size_t count)
-{
-	return memset(src,val,count);
-}
diff --git a/reactos/lib/ntdll/string/memchr.c b/reactos/lib/ntdll/string/memchr.c
index cb0589fe24b..a0d57ddbe45 100644
--- a/reactos/lib/ntdll/string/memchr.c
+++ b/reactos/lib/ntdll/string/memchr.c
@@ -1,7 +1,6 @@
 /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
 
-
-#include <crtdll/string.h>
+#include <string.h>
 
 void *
 memchr(const void *s, int c, size_t n)
diff --git a/reactos/lib/ntdll/string/memcpy.c b/reactos/lib/ntdll/string/memcpy.c
index 0e117013f2b..7d18be3bfda 100644
--- a/reactos/lib/ntdll/string/memcpy.c
+++ b/reactos/lib/ntdll/string/memcpy.c
@@ -1,15 +1,12 @@
-typedef  unsigned int size_t;
-
-void *
-memcpy (char *to, char *from, size_t count);
+#include <string.h>
 
 /* This is the most reliable way to avoid incompatibilities
    in available built-in functions on various systems.  */
 void *
-memcpy (char *to, char *from, size_t count)
+memcpy (void *to, const void *from, size_t count)
 {
-  register char *f = from;
-  register char *t = to;
+  register char *f = (char *)from;
+  register char *t = (char *)to;
   register int i = count;
 
   while (i-- > 0)
diff --git a/reactos/lib/ntdll/string/memset.c b/reactos/lib/ntdll/string/memset.c
index a17ed3f04f3..b59621a1975 100644
--- a/reactos/lib/ntdll/string/memset.c
+++ b/reactos/lib/ntdll/string/memset.c
@@ -1,8 +1,8 @@
-typedef int size_t;
+#include <string.h>
 
 void * memset(void *src,int val,size_t count)
 {
-	char *char_src = src;
+	char *char_src = (char *)src;
 
 	while(count>0) {
 		*char_src = val;
diff --git a/reactos/ntoskrnl/rtl/memcpy.c b/reactos/ntoskrnl/rtl/memcpy.c
index d307acb1482..73739854704 100644
--- a/reactos/ntoskrnl/rtl/memcpy.c
+++ b/reactos/ntoskrnl/rtl/memcpy.c
@@ -19,8 +19,8 @@
 #undef memcpy
 void *memcpy (void *to, const void *from, size_t count)
 {
-  const char *f = from;
-  char *t = to;
+  const char *f = (char*)from;
+  char *t = (char *)to;
   int i = count;
 
   while (i-- > 0)
diff --git a/reactos/ntoskrnl/rtl/memset.c b/reactos/ntoskrnl/rtl/memset.c
index e74722a2ee9..49d1e730ef6 100644
--- a/reactos/ntoskrnl/rtl/memset.c
+++ b/reactos/ntoskrnl/rtl/memset.c
@@ -3,7 +3,7 @@
 
 void * memset(void *src, int val, size_t count)
 {
-	char *char_src = src;
+	char *char_src = (char *)src;
 
 	while(count>0) {
 		*char_src = val;