diff --git a/src/google/protobuf/wire_format_unittest.cc b/src/google/protobuf/wire_format_unittest.cc
index a3062a6acd..46650605bc 100644
--- a/src/google/protobuf/wire_format_unittest.cc
+++ b/src/google/protobuf/wire_format_unittest.cc
@@ -767,7 +767,7 @@ TEST(WireFormatTest, RepeatedScalarsDifferentTagSizes) {
 }
 
 TEST(WireFormatTest, CompatibleTypes) {
-  const int64 data = 0x100000000;
+  const int64 data = 0x100000000LL;
   unittest::Int64Message msg1;
   msg1.set_data(data);
   string serialized;