diff --git a/src/Gui/3Dconnexion/GuiNativeEventLinux.cpp b/src/Gui/3Dconnexion/GuiNativeEventLinux.cpp
index 9cecc6be91..2c594f1f42 100644
--- a/src/Gui/3Dconnexion/GuiNativeEventLinux.cpp
+++ b/src/Gui/3Dconnexion/GuiNativeEventLinux.cpp
@@ -12,6 +12,8 @@ Implementation by Torsten Sadowski 2018
 
 #include <spnav.h>
 
+int Gui::GuiNativeEvent::motionDataArray[6];
+
 Gui::GuiNativeEvent::GuiNativeEvent(Gui::GUIApplicationNativeEventAware *app)
 : QObject(app)
 {
diff --git a/src/Gui/3Dconnexion/GuiNativeEventLinuxX11.cpp b/src/Gui/3Dconnexion/GuiNativeEventLinuxX11.cpp
index 2a10b63921..c714eaf03f 100644
--- a/src/Gui/3Dconnexion/GuiNativeEventLinuxX11.cpp
+++ b/src/Gui/3Dconnexion/GuiNativeEventLinuxX11.cpp
@@ -32,6 +32,8 @@ Implementation by Torsten Sadowski 2018
   #undef Complex
 #endif // #if QT_VERSION >= 0x050000
 
+int Gui::GuiNativeEvent::motionDataArray[6];
+
 Gui::GuiNativeEvent::GuiNativeEvent(Gui::GUIApplicationNativeEventAware *app)
 : QObject(app)
 {