diff --git a/mongoose.c b/mongoose.c
index 1f13be9f..7fc8dd7d 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -3892,7 +3892,7 @@ size_t mg_ws_send(struct mg_connection *c, const char *buf, size_t len,
   if (len < 126) {
     header[1] = (unsigned char) len;
     header_len = 2;
-  } else if (len < 65535) {
+  } else if (len < 65536) {
     uint16_t tmp = mg_htons((uint16_t) len);
     header[1] = 126;
     memcpy(&header[2], &tmp, sizeof(tmp));
diff --git a/src/ws.c b/src/ws.c
index 6366614c..5ee6c2d9 100644
--- a/src/ws.c
+++ b/src/ws.c
@@ -72,7 +72,7 @@ size_t mg_ws_send(struct mg_connection *c, const char *buf, size_t len,
   if (len < 126) {
     header[1] = (unsigned char) len;
     header_len = 2;
-  } else if (len < 65535) {
+  } else if (len < 65536) {
     uint16_t tmp = mg_htons((uint16_t) len);
     header[1] = 126;
     memcpy(&header[2], &tmp, sizeof(tmp));