diff --git a/mongoose.c b/mongoose.c
index 78d27c2a..5c552cb5 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -4533,7 +4533,7 @@ static size_t ws_process(uint8_t *buf, size_t len, struct ws_msg *msg) {
   }
   // Sanity check, and integer overflow protection for the boundary check below
   // data_len should not be larger than 1 Gb
-  // if (msg->data_len > 1024 * 1024 * 1024) return 0;
+  if (msg->data_len > 1024 * 1024 * 1024) return 0;
   if (msg->header_len + msg->data_len > len) return 0;
   if (mask_len > 0) {
     uint8_t *p = buf + msg->header_len, *m = p - mask_len;
diff --git a/src/ws.c b/src/ws.c
index 28cb7074..fc30c302 100644
--- a/src/ws.c
+++ b/src/ws.c
@@ -66,7 +66,7 @@ static size_t ws_process(uint8_t *buf, size_t len, struct ws_msg *msg) {
   }
   // Sanity check, and integer overflow protection for the boundary check below
   // data_len should not be larger than 1 Gb
-  // if (msg->data_len > 1024 * 1024 * 1024) return 0;
+  if (msg->data_len > 1024 * 1024 * 1024) return 0;
   if (msg->header_len + msg->data_len > len) return 0;
   if (mask_len > 0) {
     uint8_t *p = buf + msg->header_len, *m = p - mask_len;