diff --git a/3rdparty/protobuf/src/google/protobuf/stubs/port.h b/3rdparty/protobuf/src/google/protobuf/stubs/port.h
index cecefdcb3b..658c9693a1 100644
--- a/3rdparty/protobuf/src/google/protobuf/stubs/port.h
+++ b/3rdparty/protobuf/src/google/protobuf/stubs/port.h
@@ -239,8 +239,7 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
 
 #if defined(__clang__) && defined(__has_cpp_attribute) \
     && !defined(GOOGLE_PROTOBUF_OS_APPLE)
-# if defined(GOOGLE_PROTOBUF_OS_NACL) || defined(EMSCRIPTEN) || \
-     __has_cpp_attribute(clang::fallthrough)
+# if defined(GOOGLE_PROTOBUF_OS_NACL) || __has_cpp_attribute(clang::fallthrough)
 #  define GOOGLE_FALLTHROUGH_INTENDED [[clang::fallthrough]]
 # endif
 #elif defined(__GNUC__) && __GNUC__ > 6