diff --git a/src/solver.cpp b/src/solver.cpp
index 352017a6ee..c1c048e4cc 100644
--- a/src/solver.cpp
+++ b/src/solver.cpp
@@ -1186,6 +1186,8 @@ void Solver::resetMutableMemory(int const nx, int const nplist, int const nquad)
     sx_ = AmiVectorArray(nx, nplist);
     sdx_ = AmiVectorArray(nx, nplist);
 
+    dky_ = AmiVector(nx);
+
     xB_ = AmiVector(nx);
     dxB_ = AmiVector(nx);
     xQB_ = AmiVector(nquad);