diff --git a/collector/cpu_darwin.go b/collector/cpu_darwin.go
index 2a2b0062..6c461cc3 100644
--- a/collector/cpu_darwin.go
+++ b/collector/cpu_darwin.go
@@ -39,6 +39,7 @@ import (
 #include <mach/mach_init.h>
 #include <mach/mach_host.h>
 #include <mach/host_info.h>
+#include <TargetConditionals.h>
 #if TARGET_OS_MAC
 #include <libproc.h>
 #endif