diff --git a/lib/perfmon/PerfCount.h b/lib/perfmon/PerfCount.h
index 8e27f23f..90ccb275 100644
--- a/lib/perfmon/PerfCount.h
+++ b/lib/perfmon/PerfCount.h
@@ -89,6 +89,9 @@ inline uint64_t cyclecount(void){
   return tmp;
 }
 #elif defined __x86_64__
+#ifdef GRID_NVCC
+accelerator_inline uint64_t __rdtsc(void) {  return 0; }
+#endif
 inline uint64_t cyclecount(void){ 
   return __rdtsc();
   //  unsigned int dummy;