diff --git a/m4/bison-cxx-std.m4 b/m4/bison-cxx-std.m4
index 1756c7d9..afef998a 100644
--- a/m4/bison-cxx-std.m4
+++ b/m4/bison-cxx-std.m4
@@ -63,6 +63,9 @@ m4_define([_BISON_CXXSTD_11_snippet],
     for (int r: std::set<int>{1, 2})
       continue;
   }
+
+  // GCC 4.8.2 on Solaris 11.3 does not support to_string.
+  auto e = std::to_string(42);
 ])
 
 m4_define([_BISON_CXXSTD_14_snippet],