diff --git a/engines/ccgost/gosthash.c b/engines/ccgost/gosthash.c
index a5c0662ffc32f35ff7d3f8d812d3b8d8fa98b302..2a458b92bab858160227a2eeecfe901f5364d04e 100644
--- a/engines/ccgost/gosthash.c
+++ b/engines/ccgost/gosthash.c
@@ -42,8 +42,8 @@ static void circle_xor8 (const byte *w, byte *k)
 	byte buf[8];
 	int i;
 	memcpy(buf,w,8);
-	memcpy(k,w+8,24);
-	for(i=0;i<8;i++) 
+	memmove(k,w+8,24);
+	for(i=0;i<8;i++)
 		k[i+24]=buf[i]^k[i];
 	}