diff --git a/src/Main/MainGui.cpp b/src/Main/MainGui.cpp
index 4621bf3f9..6891628e1 100644
--- a/src/Main/MainGui.cpp
+++ b/src/Main/MainGui.cpp
@@ -98,6 +98,9 @@ int main( int argc, char ** argv )
     QFile::setEncodingFunction(myEncoderFunc);
     QFile::setDecodingFunction(myDecoderFunc);
 #endif
+    // See https://forum.freecadweb.org/viewtopic.php?f=18&t=20600
+    // See Gui::Application::runApplication()
+    putenv("LC_NUMERIC=C");
     putenv("PYTHONPATH=");
 #elif defined(FC_OS_MACOSX)
     (void)QLocale::system();