diff --git a/src/Main/MainGui.cpp b/src/Main/MainGui.cpp
index aeabd66c71..3a7628d223 100644
--- a/src/Main/MainGui.cpp
+++ b/src/Main/MainGui.cpp
@@ -109,7 +109,11 @@ int main( int argc, char ** argv )
     _putenv("PYTHONPATH=");
     // https://forum.freecadweb.org/viewtopic.php?f=4&t=18288
     // https://forum.freecadweb.org/viewtopic.php?f=3&t=20515
-    _putenv("PYTHONHOME=");
+    const char* fc_py_home = getenv("FC_PYTHONHOME");
+    if (fc_py_home)
+        _putenv_s("PYTHONHOME", fc_py_home);
+    else
+        _putenv("PYTHONHOME=");
 #endif
 
 #if defined (FC_OS_WIN32)