diff --git a/libs/pbd/cpus.cc b/libs/pbd/cpus.cc
index 0f73d51027..ffb11871ba 100644
--- a/libs/pbd/cpus.cc
+++ b/libs/pbd/cpus.cc
@@ -28,6 +28,8 @@
 #include <stddef.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
+#elif defined(PLATFORM_WINDOWS)
+#include <Windows.h>
 #endif
 
 #include "pbd/cpus.h"
@@ -48,6 +50,10 @@ hardware_concurrency()
 #elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
         int const count=sysconf(_SC_NPROCESSORS_ONLN);
         return (count>0)?count:0;
+#elif defined(PLATFORM_WINDOWS)
+		SYSTEM_INFO sys_info;
+		GetSystemInfo( &sys_info );
+		return sys_info.dwNumberOfProcessors;
 #else
         return 0;
 #endif