diff --git a/lib/http2.c b/lib/http2.c
index 68ee4805e8..56aa798d0d 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -203,6 +203,7 @@ static void cf_h2_ctx_close(struct cf_h2_ctx *ctx)
 {
   if(ctx->h2) {
     nghttp2_session_del(ctx->h2);
+    ctx->h2 = NULL;
   }
 }