diff --git a/base/md5c.cpp b/base/md5c.cpp
index ed66adb..8592d39 100755
--- a/base/md5c.cpp
+++ b/base/md5c.cpp
@@ -155,7 +155,7 @@ MD5Final(unsigned char digest[16], struct MD5Context *ctx)
 	putu32(ctx->buf[1], digest + 4);
 	putu32(ctx->buf[2], digest + 8);
 	putu32(ctx->buf[3], digest + 12);
-	memset(ctx->buf, 0, sizeof(ctx->buf));	/* In case it's sensitive */
+	memset(ctx, 0, sizeof(*ctx));	/* In case it's sensitive */
 }
 
 #ifndef ASM_MD5