diff --git a/src/Mod/Drawing/App/DrawingExport.cpp b/src/Mod/Drawing/App/DrawingExport.cpp
index 0c3c23231d..550b12c25b 100644
--- a/src/Mod/Drawing/App/DrawingExport.cpp
+++ b/src/Mod/Drawing/App/DrawingExport.cpp
@@ -81,6 +81,7 @@
 #include <Base/Vector3D.h>
 
 using namespace Drawing;
+using namespace std;
 
 TopoDS_Edge DrawingOutput::asCircle(const BRepAdaptor_Curve& c) const
 {
diff --git a/src/Mod/Part/App/Geometry2d.cpp b/src/Mod/Part/App/Geometry2d.cpp
index fb1de909c1..9794655339 100644
--- a/src/Mod/Part/App/Geometry2d.cpp
+++ b/src/Mod/Part/App/Geometry2d.cpp
@@ -83,6 +83,7 @@
 #include <Mod/Part/App/Geom2d/OffsetCurve2dPy.h>
 
 using namespace Part;
+using namespace std;
 
 extern const char* gce_ErrorStatusText(gce_ErrorType et);
 
diff --git a/src/Mod/Raytracing/App/AppRaytracingPy.cpp b/src/Mod/Raytracing/App/AppRaytracingPy.cpp
index d48c51c97a..1bb2b1b011 100644
--- a/src/Mod/Raytracing/App/AppRaytracingPy.cpp
+++ b/src/Mod/Raytracing/App/AppRaytracingPy.cpp
@@ -40,6 +40,8 @@
 #include <Mod/Part/App/TopoShapePy.h>
 #include <App/Application.h>
 
+using namespace std;
+
 
 namespace Raytracing {
 class Module : public Py::ExtensionModule<Module>
diff --git a/src/Mod/Raytracing/App/LuxFeature.cpp b/src/Mod/Raytracing/App/LuxFeature.cpp
index 930fe12b7b..d1e0a00896 100644
--- a/src/Mod/Raytracing/App/LuxFeature.cpp
+++ b/src/Mod/Raytracing/App/LuxFeature.cpp
@@ -38,6 +38,7 @@
 
 
 using namespace Raytracing;
+using namespace std;
 
 PROPERTY_SOURCE(Raytracing::LuxFeature, Raytracing::RaySegment)
 
diff --git a/src/Mod/Raytracing/App/RayFeature.cpp b/src/Mod/Raytracing/App/RayFeature.cpp
index cdd2cb6dc1..235a986851 100644
--- a/src/Mod/Raytracing/App/RayFeature.cpp
+++ b/src/Mod/Raytracing/App/RayFeature.cpp
@@ -36,6 +36,7 @@
 
 
 using namespace Raytracing;
+using namespace std;
 
 PROPERTY_SOURCE(Raytracing::RayFeature, Raytracing::RaySegment)
 
diff --git a/src/Mod/TechDraw/App/Cosmetic.cpp b/src/Mod/TechDraw/App/Cosmetic.cpp
index 31c90c968d..c5fd2ee87a 100644
--- a/src/Mod/TechDraw/App/Cosmetic.cpp
+++ b/src/Mod/TechDraw/App/Cosmetic.cpp
@@ -61,6 +61,7 @@
 #include "Cosmetic.h"
 
 using namespace TechDraw;
+using namespace std;
 
 LineFormat::LineFormat()
 {
diff --git a/src/Mod/TechDraw/App/Geometry.cpp b/src/Mod/TechDraw/App/Geometry.cpp
index c10b631775..d34eeb9bbf 100644
--- a/src/Mod/TechDraw/App/Geometry.cpp
+++ b/src/Mod/TechDraw/App/Geometry.cpp
@@ -80,6 +80,7 @@
 #include "Geometry.h"
 
 using namespace TechDraw;
+using namespace std;
 
 // Collection of Geometric Features
 Wire::Wire()