diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 1989f209..9ee150c6 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -22,6 +22,7 @@
 #
 # Please keep the list sorted.
 
+Arne Beer <arne@twobeer.de>
 Christopher Seymour <chris.j.seymour@hotmail.com>
 David Coeurjolly <david.coeurjolly@liris.cnrs.fr>
 Dominic Hamon <dma@stripysock.com>
diff --git a/src/benchmark.cc b/src/benchmark.cc
index dc8c6f3f..7e1357f6 100644
--- a/src/benchmark.cc
+++ b/src/benchmark.cc
@@ -863,7 +863,7 @@ void Benchmark::RunInstance(const Instance& b, const BenchmarkReporter* br) {
 
 // Run the specified benchmark, measure its peak memory usage, and
 // return the peak memory usage.
-double Benchmark::MeasurePeakHeapMemory() {
+double Benchmark::MeasurePeakHeapMemory(const Instance&) {
   if (!get_memory_usage) return 0.0;
   double bytes = 0.0;
   /*  TODO(dominich)