diff --git a/lisa/wlgen/rta.py b/lisa/wlgen/rta.py
index 04a83b9faee952b2cf2ff90f4cd7b837ed04ec54..eef2239860caa4ba052261e6c8de4be7544f4a80 100644
--- a/lisa/wlgen/rta.py
+++ b/lisa/wlgen/rta.py
@@ -902,7 +902,11 @@ class Ramp(RTATask):
         sign = +1 if start_pct <= end_pct else -1
         delta_pct = sign * abs(delta_pct)
 
-        steps = list(itertools.takewhile(lambda x: x <= end_pct, itertools.count(start_pct, delta_pct)))
+        if start_pct <= end_pct:
+            steps = list(itertools.takewhile(lambda x: x <= end_pct, itertools.count(start_pct, delta_pct)))
+        else:
+            steps = list(itertools.takewhile(lambda x: x >= end_pct, itertools.count(start_pct, delta_pct)))
+
         # clip the last step
         steps[-1] = end_pct