1 files changed, 1 insertions, 1 deletions

diff --git a/bin/rtspin.c b/bin/rtspin.c
index 939d507..0995d01 100644
--- a/bin/rtspin.c
+++ b/bin/rtspin.c
@@ -186,7 +186,7 @@ double tri_wave(int count, struct wave_data* w)
 {
         double step = count % w->period;
         double v = 2.0 * (step/w->period - floor(step/w->period + 0.5));
-        double exe = w->min_wcet_ms + w->amplitude * abs(v);
+        double exe = w->min_wcet_ms + w->amplitude * fabs(v);
         return(exe);
 }