diff --git a/test/cpp/qps/limit_cores.cc b/test/cpp/qps/limit_cores.cc
index fad9a323afd..c9931d91304 100644
--- a/test/cpp/qps/limit_cores.cc
+++ b/test/cpp/qps/limit_cores.cc
@@ -37,14 +37,15 @@
 #include <grpc/support/log.h>
 #include <grpc/support/port_platform.h>
 
-namespace grpc {
-namespace testing {
-
 #ifdef GPR_CPU_LINUX
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
 #include <sched.h>
+
+namespace grpc {
+namespace testing {
+
 int LimitCores(const int* cores, int cores_size) {
   const int num_cores = gpr_cpu_num_cores();
   int cores_set = 0;
@@ -72,6 +73,10 @@ int LimitCores(const int* cores, int cores_size) {
   return cores_set;
 }
 #else
+
+namespace grpc {
+namespace testing {
+
 // LimitCores is not currently supported for non-Linux platforms
 int LimitCores(const int*, int) { return gpr_cpu_num_cores(); }
 #endif