diff --git a/lib/cpp/test/AllProtocolTests.tcc b/lib/cpp/test/AllProtocolTests.tcc
index 8c8eaa8..3e0b833 100644
--- a/lib/cpp/test/AllProtocolTests.tcc
+++ b/lib/cpp/test/AllProtocolTests.tcc
@@ -190,14 +190,14 @@
 
     testNaked<TProto, int64_t>(0);
     for (int64_t i = 0; i < 62; i++) {
-      testNaked<TProto, int64_t>(1L << i);
-      testNaked<TProto, int64_t>(-(1L << i));
+      testNaked<TProto, int64_t>(1LL << i);
+      testNaked<TProto, int64_t>(-(1LL << i));
     }
 
     testField<TProto, T_I64, int64_t>(0);
     for (int i = 0; i < 62; i++) {
-      testField<TProto, T_I64, int64_t>(1L << i);
-      testField<TProto, T_I64, int64_t>(-(1L << i));
+      testField<TProto, T_I64, int64_t>(1LL << i);
+      testField<TProto, T_I64, int64_t>(-(1LL << i));
     }
 
     testNaked<TProto, double>(123.456);