diff --git a/.github/workflows/javascript_builds.yml b/.github/workflows/javascript_builds.yml
index ced2c36a91a..7f7ebf680fd 100644
--- a/.github/workflows/javascript_builds.yml
+++ b/.github/workflows/javascript_builds.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 # Global Settings
 env:
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: platform=javascript verbose=yes warnings=extra debug_symbols=no --jobs=2
+  SCONSFLAGS: platform=javascript verbose=yes warnings=extra werror=yes debug_symbols=no --jobs=2
   SCONS_CACHE_LIMIT: 4096
   EM_VERSION: 2.0.25
   EM_CACHE_FOLDER: 'emsdk-cache'
diff --git a/modules/freetype/SCsub b/modules/freetype/SCsub
index fc2535a6ca0..476cb9cf2ad 100644
--- a/modules/freetype/SCsub
+++ b/modules/freetype/SCsub
@@ -80,6 +80,7 @@ if env["builtin_freetype"]:
         # Forcibly undefine this macro so SIMD is not used in this file,
         # since currently unsupported in WASM
         tmp_env = env_freetype.Clone()
+        tmp_env.disable_warnings()
         tmp_env.Append(CPPFLAGS=["-U__OPTIMIZE__"])
         sfnt = tmp_env.Object(sfnt)
     thirdparty_sources += [sfnt]
diff --git a/modules/websocket/emws_peer.cpp b/modules/websocket/emws_peer.cpp
index 69822f6ff3f..d7263dcf434 100644
--- a/modules/websocket/emws_peer.cpp
+++ b/modules/websocket/emws_peer.cpp
@@ -54,7 +54,7 @@ Error EMWSPeer::read_msg(const uint8_t *p_data, uint32_t p_size, bool p_is_strin
 }
 
 Error EMWSPeer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
-	ERR_FAIL_COND_V(_out_buf_size && (godot_js_websocket_buffered_amount(peer_sock) >= (1ULL << _out_buf_size)), ERR_OUT_OF_MEMORY);
+	ERR_FAIL_COND_V(_out_buf_size && ((uint64_t)godot_js_websocket_buffered_amount(peer_sock) >= (1ULL << _out_buf_size)), ERR_OUT_OF_MEMORY);
 
 	int is_bin = write_mode == WebSocketPeer::WRITE_MODE_BINARY ? 1 : 0;