diff --git a/library/md2.c b/library/md2.c
index 7bd5769..f6dd349 100644
--- a/library/md2.c
+++ b/library/md2.c
@@ -70,7 +70,10 @@
  */
 void md2_starts( md2_context *ctx )
 {
-    memset( ctx, 0, sizeof( md2_context ) );
+    memset( ctx->cksum, 0, 16 );
+    memset( ctx->state, 0, 46 );
+    memset( ctx->buffer, 0, 16 );
+    ctx->left = 0;
 }
 
 static void md2_process( md2_context *ctx )