diff --git a/src/preprocessors/perf_indicators.c b/src/preprocessors/perf_indicators.c
index d859fe7..c183552 100755
--- a/src/preprocessors/perf_indicators.c
+++ b/src/preprocessors/perf_indicators.c
@@ -25,2 +25,3 @@
 #include "perf_indicators.h"
+#include "cpuclock.h" /* get_ticks_per_usec */