diff --git a/pipeline/adjusters.py b/pipeline/adjusters.py
index 97afeb3..ec97595 100644
--- a/pipeline/adjusters.py
+++ b/pipeline/adjusters.py
@@ -55,6 +55,10 @@ class TargetTimeAdjuster(Adjuster):
             target_time_max = time + (time * margin / 100)
             target_time_min = time - (time * margin / 100)
 
+        # ensure we don't have negative times
+        if type(target_time_min) is float and target_time_min < 0:
+            target_time_min = 0.0
+
         return (target_time_min, target_time_max)
 
     def _features_total_time(self, features: list) -> float: