diff --git a/NumLib/Fem/FiniteElement/TemplateIsoparametric.h b/NumLib/Fem/FiniteElement/TemplateIsoparametric.h
index 3fc421d4e7669104cb88ce83101834d7b51dcc86..bd8f5344355d60e327106f662d7275948f7d5cfa 100644
--- a/NumLib/Fem/FiniteElement/TemplateIsoparametric.h
+++ b/NumLib/Fem/FiniteElement/TemplateIsoparametric.h
@@ -18,6 +18,11 @@
 #include "NumLib/Fem/CoordinatesMapping/NaturalCoordinatesMapping.h"
 #include "NumLib/Fem/CoordinatesMapping/ShapeMatrices.h"
 
+namespace MeshLib
+{
+class Element;
+}
+
 namespace NumLib
 {
 /**