diff --git a/src/fastlock.cpp b/src/fastlock.cpp
index 861bfb7ca..037b33903 100644
--- a/src/fastlock.cpp
+++ b/src/fastlock.cpp
@@ -27,6 +27,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "fmacros.h"
 #include "fastlock.h"
 #include <unistd.h>
 #include <sys/syscall.h>