diff --git a/Grid/threads/Accelerator.cc b/Grid/threads/Accelerator.cc
index 74d1f585..2aa0d300 100644
--- a/Grid/threads/Accelerator.cc
+++ b/Grid/threads/Accelerator.cc
@@ -67,7 +67,7 @@ void acceleratorInit(void)
 	printf("AcceleratorCudaInit[%d]: Device identifier: %s\n",rank, prop.name);
 
 
-	GPU_PROP_FMT(totalGlobalMem,"%lld");
+	GPU_PROP_FMT(totalGlobalMem,"%zu");
 	GPU_PROP(managedMemory);
 	GPU_PROP(isMultiGpuBoard);
 	GPU_PROP(warpSize);