diff --git a/Grid/communicator/SharedMemoryMPI.cc b/Grid/communicator/SharedMemoryMPI.cc
index 4993a02e..9a273dc4 100644
--- a/Grid/communicator/SharedMemoryMPI.cc
+++ b/Grid/communicator/SharedMemoryMPI.cc
@@ -29,6 +29,7 @@ Author: Christoph Lehner <christoph@lhnr.de>
 
 #include <Grid/GridCore.h>
 #include <pwd.h>
+#include <syscall.h>
 
 #ifdef GRID_CUDA
 #include <cuda_runtime_api.h>