diff --git a/src/impl/vamp/planning/phs.hh b/src/impl/vamp/planning/phs.hh
index 958e6a31..eb43e1b6 100644
--- a/src/impl/vamp/planning/phs.hh
+++ b/src/impl/vamp/planning/phs.hh
@@ -164,7 +164,7 @@ namespace vamp::planning
 
             // Clamp values
             Robot::descale_configuration(x);
-            x.clamp(0.F, 1.F);
+            x = x.clamp(0.F, 1.F);
             Robot::scale_configuration(x);
 
             return x;