diff --git a/src/Mod/Surface/App/Blending/FeatureBlendCurve.cpp b/src/Mod/Surface/App/Blending/FeatureBlendCurve.cpp
index 0964bcdc2c..c7c1c4c515 100644
--- a/src/Mod/Surface/App/Blending/FeatureBlendCurve.cpp
+++ b/src/Mod/Surface/App/Blending/FeatureBlendCurve.cpp
@@ -46,7 +46,7 @@ const App::PropertyIntegerConstraint::Constraints EndContinuityConstraint = {0,
 
 PROPERTY_SOURCE(Surface::FeatureBlendCurve, Part::Spline)
 
-FeatureBlendCurve::FeatureBlendCurve() : lockOnChangeMutex(false)
+FeatureBlendCurve::FeatureBlendCurve()
 {
     ADD_PROPERTY_TYPE(StartEdge, (nullptr), "FirstEdge", App::Prop_None, "");
     ADD_PROPERTY_TYPE(StartContinuity, (2), "FirstEdge", App::Prop_None, "");
diff --git a/src/Mod/Surface/App/Blending/FeatureBlendCurve.h b/src/Mod/Surface/App/Blending/FeatureBlendCurve.h
index 6ff4329a32..a792e83bca 100644
--- a/src/Mod/Surface/App/Blending/FeatureBlendCurve.h
+++ b/src/Mod/Surface/App/Blending/FeatureBlendCurve.h
@@ -63,7 +63,7 @@ public:
 private:
     BlendPoint GetBlendPoint(App::PropertyLinkSub &link, App::PropertyFloatConstraint &param, App::PropertyIntegerConstraint &Continuity);
     double RelativeToRealParameters(double, double, double);
-    bool lockOnChangeMutex;
+    bool lockOnChangeMutex{false};
 
 protected:
     void onChanged(const App::Property *prop) override;
diff --git a/src/Mod/Surface/App/FeatureExtend.cpp b/src/Mod/Surface/App/FeatureExtend.cpp
index 7c97d0a272..31f19f55b2 100644
--- a/src/Mod/Surface/App/FeatureExtend.cpp
+++ b/src/Mod/Surface/App/FeatureExtend.cpp
@@ -47,7 +47,7 @@ const App::PropertyFloatConstraint::Constraints ToleranceRange = {0.0, 10.0, 0.0
 const App::PropertyFloatConstraint::Constraints ExtendRange = {-0.5, 10.0, 0.01};
 PROPERTY_SOURCE(Surface::Extend, Part::Spline)
 
-Extend::Extend() : lockOnChangeMutex(false)
+Extend::Extend()
 {
     ADD_PROPERTY(Face,(nullptr));
     Face.setScope(App::LinkScope::Global);
diff --git a/src/Mod/Surface/App/FeatureExtend.h b/src/Mod/Surface/App/FeatureExtend.h
index 7ae7886164..c85335b4bb 100644
--- a/src/Mod/Surface/App/FeatureExtend.h
+++ b/src/Mod/Surface/App/FeatureExtend.h
@@ -64,7 +64,7 @@ protected:
                                            const char *PropName) override;
 
 private:
-    bool lockOnChangeMutex;
+    bool lockOnChangeMutex{false};
 };
 
 }//Namespace Surface