diff --git a/repos/os/src/test/cpu_bench/bogomips.h b/repos/os/src/test/cpu_bench/bogomips.h
index d709d8e1b..7e5d58880 100644
--- a/repos/os/src/test/cpu_bench/bogomips.h
+++ b/repos/os/src/test/cpu_bench/bogomips.h
@@ -3,6 +3,6 @@ void bogomips() __attribute__((optimize("O0")));
 
 void bogomips()
 {
-	for (register unsigned i = 0; i < 1000000000; i++) ;
+	for (unsigned i = 0; i < 1000000000; i++) ;
 };