diff --git a/src/ZMPRefTrajectoryGeneration/DynamicFilter.cpp b/src/ZMPRefTrajectoryGeneration/DynamicFilter.cpp
index e102747c2b48ce83419edb60326fdca71ab6e508..58394ed58c9e4464502d34b025e9f1e26e749fef 100644
--- a/src/ZMPRefTrajectoryGeneration/DynamicFilter.cpp
+++ b/src/ZMPRefTrajectoryGeneration/DynamicFilter.cpp
@@ -431,7 +431,7 @@ int DynamicFilter::OptimalControl(
   assert(PC_->IsCoherent());
   int Nctrl = (int)round(controlWindowSize_/controlPeriod_) ;
 
-  outputDeltaCOMTraj_deq_.resize(Nctrl);
+  assert(outputDeltaCOMTraj_deq_.size()==Nctrl);
   double deltaZMPx = 0.0 ;
   double deltaZMPy = 0.0 ;
   // computation of the preview control along the "deltaZMP_deq_"