diff --git a/lib/Threads.h b/lib/Threads.h
index 9d1295e5..b8915d74 100644
--- a/lib/Threads.h
+++ b/lib/Threads.h
@@ -37,7 +37,7 @@ Author: paboyle <paboyle@ph.ed.ac.uk>
 
 #ifdef GRID_OMP
 #include <omp.h>
-#define PARALLEL_FOR_LOOP _Pragma("omp parallel for ")
+#define PARALLEL_FOR_LOOP _Pragma("omp parallel for schedule(runtime)")
 #define PARALLEL_NESTED_LOOP2 _Pragma("omp parallel for collapse(2)")
 #else
 #define PARALLEL_FOR_LOOP