diff --git a/DocxRenderer/src/logic/Page.cpp b/DocxRenderer/src/logic/Page.cpp
index 66fde21a73..f8bf37a421 100644
--- a/DocxRenderer/src/logic/Page.cpp
+++ b/DocxRenderer/src/logic/Page.cpp
@@ -286,7 +286,7 @@ namespace NSDocxRenderer
 
             m_arShapes.push_back(pShape);
 
-			double dDeterminant = sqrt(m_pTransform->Determinant());
+			double dDeterminant = sqrt(fabs(m_pTransform->Determinant()));
 			pShape->m_oPen.Size *= dDeterminant;
         }
     }