diff --git a/benchmark/uint64.cpp b/benchmark/uint64.cpp
index 44ef9fd4..94be050a 100644
--- a/benchmark/uint64.cpp
+++ b/benchmark/uint64.cpp
@@ -313,7 +313,17 @@ int main()
 {
     init_indices();
 
+#if defined(BOOST_LIBSTDCXX_VERSION) && __SIZE_WIDTH__ == 32
+
+    // Pathological behavior:
+    // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104945
+
+#else
+
     test<std_unordered_map>( "std::unordered_map" );
+
+#endif
+
     test<boost_unordered_map>( "boost::unordered_map" );
     test<boost_unordered_flat_map>( "boost::unordered_flat_map" );