diff --git a/src/benchmark_register.cc b/src/benchmark_register.cc
index 4e580d8e..cf78bbf4 100644
--- a/src/benchmark_register.cc
+++ b/src/benchmark_register.cc
@@ -163,7 +163,7 @@ bool BenchmarkFamilies::FindBenchmarks(
             }
           }
 
-          AppendHumanReadable(arg, &instance.name);
+          instance.name += std::to_string(arg);
           ++arg_i;
         }