diff --git a/src/Gui/SoFCUnifiedSelection.cpp b/src/Gui/SoFCUnifiedSelection.cpp
index 7013d1755027..87321a05c500 100644
--- a/src/Gui/SoFCUnifiedSelection.cpp
+++ b/src/Gui/SoFCUnifiedSelection.cpp
@@ -64,6 +64,15 @@
 #include <Inventor/events/SoLocation2Event.h>
 #include <Inventor/SoPickedPoint.h>
 
+#ifdef FC_OS_MACOSX
+# include <OpenGL/gl.h>
+#else
+# ifdef FC_OS_WIN32
+#  include <windows.h>
+# endif
+# include <GL/gl.h>
+#endif
+
 #include <QtOpenGL.h>
 
 #include <Base/Console.h>
diff --git a/src/Gui/SoFCUnifiedSelection.h b/src/Gui/SoFCUnifiedSelection.h
index 050eeb85ddda..0dbaae20711a 100644
--- a/src/Gui/SoFCUnifiedSelection.h
+++ b/src/Gui/SoFCUnifiedSelection.h
@@ -23,16 +23,6 @@
 #ifndef GUI_SOFCUNIFIEDSELECTION_H
 #define GUI_SOFCUNIFIEDSELECTION_H
 
-# ifdef FC_OS_MACOSX
-# include <OpenGL/gl.h>
-# else
-# ifdef FC_OS_WIN32
-#  define NOMINMAX
-#  include <windows.h>
-# endif
-# include <GL/gl.h>
-# endif
-
 #include <Inventor/nodes/SoSubNode.h>
 #include <Inventor/nodes/SoSeparator.h>
 #include <Inventor/fields/SoSFBool.h>
diff --git a/src/Mod/Image/Gui/OpenGLImageBox.cpp b/src/Mod/Image/Gui/OpenGLImageBox.cpp
index a8fb1a23fa78..58c460e75524 100644
--- a/src/Mod/Image/Gui/OpenGLImageBox.cpp
+++ b/src/Mod/Image/Gui/OpenGLImageBox.cpp
@@ -34,6 +34,7 @@
 #elif defined (FC_OS_MACOSX)
 # include <OpenGL/gl.h>
 # include <OpenGL/glu.h>
+# include <GLKit/GLKMatrix4.h>
 #elif defined (FC_OS_WIN32)
 # include <Windows.h>
 # include <GL/gl.h>
@@ -150,7 +151,12 @@ void GLImageBox::resizeGL( int w, int h )
     glViewport( 0, 0, (GLint)w, (GLint)h );
     glMatrixMode( GL_PROJECTION );
     glLoadIdentity();
+#if defined (FC_OS_MACOSX)
+    GLKMatrix4 orthoMat = GLKMatrix4MakeOrtho(0, width() - 1, height() - 1, 0, -1, 1);
+    glLoadMatrixf(orthoMat.m);
+#else
     gluOrtho2D(0, width() - 1, height() - 1, 0);
+#endif
     glMatrixMode(GL_MODELVIEW);
 }