diff --git a/README.md b/README.md
index 560464eb..b43d4d20 100644
--- a/README.md
+++ b/README.md
@@ -622,7 +622,7 @@ that might be used to customize high-order term calculation.
 
 ```c++
 BENCHMARK(BM_StringCompare)->RangeMultiplier(2)
-    ->Range(1<<10, 1<<18)->Complexity([](int64_t n)->double{return n; });
+    ->Range(1<<10, 1<<18)->Complexity([](benchmark::IterationCount n)->double{return n; });
 ```
 
 <a name="templated-benchmarks" />