diff --git a/src/core/ActionWithValue.cpp b/src/core/ActionWithValue.cpp
index 7a921ddbd941188b27365e8ad3d526823a80cd8c..3106b8f699d73cd6c063b7eb0e70bdf22d8007bd 100644
--- a/src/core/ActionWithValue.cpp
+++ b/src/core/ActionWithValue.cpp
@@ -70,7 +70,7 @@ void ActionWithValue::clearInputForces() {
 }
 
 void ActionWithValue::clearDerivatives() {
-  unsigned nt = OpenMP::getNumThreads(values);
+  unsigned nt = OpenMP::getNumThreads();
   #pragma omp parallel num_threads(nt)
   {
     #pragma omp for