diff --git a/ProcessLib/SmallDeformation/SmallDeformationProcessData.h b/ProcessLib/SmallDeformation/SmallDeformationProcessData.h
index 1f38128b892ddef03150929eb07ccd5bc743b849..8545a642c3014dfff2ad084eb00ea79cb06da798 100644
--- a/ProcessLib/SmallDeformation/SmallDeformationProcessData.h
+++ b/ProcessLib/SmallDeformation/SmallDeformationProcessData.h
@@ -45,8 +45,8 @@ struct SmallDeformationProcessData
 
     std::unique_ptr<MaterialLib::Solids::MechanicsBase<DisplacementDim>>
         _material;
-    double dt;
-    double t;
+    double dt = 0;
+    double t = 0;
 };
 
 }  // namespace SmallDeformation