diff --git a/base/modules/fakempi.c b/base/modules/fakempi.c
index e74b69b4c..603a2445f 100644
--- a/base/modules/fakempi.c
+++ b/base/modules/fakempi.c
@@ -116,7 +116,7 @@ double mpi_wtime()
 
   QueryPerformanceCounter(&tim);
   QeryPerformanceFrequency(&freq);
-  seconds = (double)tim / (double)freq;
+  seconds = (double)(tim.QuadPart) / (double)(freq.QuadPart);
   return(seconds);
 #else
   struct timeval tt;