diff --git a/src/Mod/Fem/Gui/PreCompiled.h b/src/Mod/Fem/Gui/PreCompiled.h
index 11a23dbce8..ef1398cef0 100644
--- a/src/Mod/Fem/Gui/PreCompiled.h
+++ b/src/Mod/Fem/Gui/PreCompiled.h
@@ -56,7 +56,9 @@
 
 #ifdef FC_OS_WIN32
 #define WIN32_LEAN_AND_MEAN
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 #include <windows.h>
 #endif
 
diff --git a/src/Mod/PartDesign/Gui/PreCompiled.h b/src/Mod/PartDesign/Gui/PreCompiled.h
index 29ac54ca4a..99ed7a3261 100644
--- a/src/Mod/PartDesign/Gui/PreCompiled.h
+++ b/src/Mod/PartDesign/Gui/PreCompiled.h
@@ -32,9 +32,10 @@
 #ifdef _PreComp_
 
 #ifdef FC_OS_WIN32
-# undef NOMINMAX
-# define NOMINMAX
-# include <windows.h>
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#include <windows.h>
 #endif
 
 // Boost
diff --git a/src/Mod/Sketcher/Gui/PreCompiled.h b/src/Mod/Sketcher/Gui/PreCompiled.h
index a194183e87..28ff06cedf 100644
--- a/src/Mod/Sketcher/Gui/PreCompiled.h
+++ b/src/Mod/Sketcher/Gui/PreCompiled.h
@@ -49,7 +49,9 @@
 #include <boost/math/special_functions/fpclassify.hpp>
 
 #ifdef FC_OS_WIN32
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 #include <windows.h>
 #endif
 
diff --git a/src/Mod/TechDraw/Gui/PreCompiled.h b/src/Mod/TechDraw/Gui/PreCompiled.h
index 487a0962bd..5f034dad6c 100644
--- a/src/Mod/TechDraw/Gui/PreCompiled.h
+++ b/src/Mod/TechDraw/Gui/PreCompiled.h
@@ -30,7 +30,9 @@
 #endif
 
 #ifdef FC_OS_WIN32
-# define NOMINMAX
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
 #endif
 
 #ifdef _PreComp_