diff --git a/src/libs/vtools/dialogs/tools/dialogflippingbyline.cpp b/src/libs/vtools/dialogs/tools/dialogflippingbyline.cpp
index 60044b33c..3f98b32ae 100644
--- a/src/libs/vtools/dialogs/tools/dialogflippingbyline.cpp
+++ b/src/libs/vtools/dialogs/tools/dialogflippingbyline.cpp
@@ -67,6 +67,7 @@ DialogFlippingByLine::DialogFlippingByLine(const VContainer *data, quint32 toolI
       stage1(true),
       m_suffix(),
       flagName(true),
+      flagGroupName(true),
       flagError(false)
 {
     ui->setupUi(this);