diff --git a/src/particle_restart_write.F90 b/src/particle_restart_write.F90
index ba22d19d0e..f76537aa38 100644
--- a/src/particle_restart_write.F90
+++ b/src/particle_restart_write.F90
@@ -38,6 +38,7 @@ contains
     filename = trim(filename) // '.binary'
 #endif
 
+!$omp critical
     ! Create file
     call pr % file_create(filename)
 
@@ -59,6 +60,7 @@ contains
 
     ! Close file
     call pr % file_close()
+!$omp end critical
 
   end subroutine write_particle_restart