diff --git a/examples/common.cpp b/examples/common.cpp
index 49ce6e66a..1b77fef43 100644
--- a/examples/common.cpp
+++ b/examples/common.cpp
@@ -7,6 +7,11 @@
 #include <iterator>
 #include <algorithm>
 
+#elif defined(__APPLE__) && defined(__MACH__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
 #if defined (_WIN32)
 #include <fcntl.h>
 #include <io.h>
@@ -37,6 +42,7 @@ int32_t get_num_physical_cores() {
         }
     }
 #elif defined(__APPLE__) && defined(__MACH__)
+
     int32_t num_physical_cores;
     size_t len = sizeof(num_physical_cores);
     int result = sysctlbyname("hw.perflevel0.physicalcpu", &num_physical_cores, &len, NULL, 0);