diff --git a/libs/pbd/cpus.cc b/libs/pbd/cpus.cc
index f43b128da1..fed7725b76 100644
--- a/libs/pbd/cpus.cc
+++ b/libs/pbd/cpus.cc
@@ -50,23 +50,23 @@ hardware_concurrency()
 		}
 	}
 #if defined(PTW32_VERSION) || defined(__hpux)
-        return pthread_num_processors_np();
+	return pthread_num_processors_np();
 #elif defined(__APPLE__)
-        int count;
-        size_t size=sizeof(count);
-        return sysctlbyname("hw.physicalcpu",&count,&size,NULL,0)?0:count;
+	int count;
+	size_t size=sizeof(count);
+	return sysctlbyname("hw.physicalcpu",&count,&size,NULL,0)?0:count;
 #elif defined(__FreeBSD__)
-        int count;
-        size_t size=sizeof(count);
-        return sysctlbyname("hw.ncpu",&count,&size,NULL,0)?0:count;
+	int count;
+	size_t size=sizeof(count);
+	return sysctlbyname("hw.ncpu",&count,&size,NULL,0)?0:count;
 #elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
-        int const count=sysconf(_SC_NPROCESSORS_ONLN);
-        return (count>0)?count:0;
+	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;
+	SYSTEM_INFO sys_info;
+	GetSystemInfo( &sys_info );
+	return sys_info.dwNumberOfProcessors;
 #else
-        return 0;
+	return 0;
 #endif
 }