1 files changed, 6 insertions, 2 deletions
diff --git a/Carpet/CycleClock/src/cycleclock.h b/Carpet/CycleClock/src/cycleclock.h
index c985609f1..f2ab56343 100644
--- a/Carpet/CycleClock/src/cycleclock.h
+++ b/Carpet/CycleClock/src/cycleclock.h
@@ -22,8 +22,12 @@ extern "C" {
   
 #include "cycle.h"
   
-  double seconds_per_tick();
-  void measure_tick();
+#ifndef HAVE_TICK_COUNTER
+#  error "tick counter not available"
+#endif
+  
+  double seconds_per_tick(void);
+  void measure_tick(void);
   
 #ifdef __cplusplus
 }