diff --git a/src/gtk/spinctrl.cpp b/src/gtk/spinctrl.cpp
index 5e13787f4b..d7bbb53e30 100644
--- a/src/gtk/spinctrl.cpp
+++ b/src/gtk/spinctrl.cpp
@@ -30,6 +30,8 @@
 extern void wxapp_install_idle_handler();
 extern bool g_isIdle;
 
+static const float sensitivity = 0.02;
+
 //-----------------------------------------------------------------------------
 // data
 //-----------------------------------------------------------------------------
diff --git a/src/gtk1/spinctrl.cpp b/src/gtk1/spinctrl.cpp
index 5e13787f4b..d7bbb53e30 100644
--- a/src/gtk1/spinctrl.cpp
+++ b/src/gtk1/spinctrl.cpp
@@ -30,6 +30,8 @@
 extern void wxapp_install_idle_handler();
 extern bool g_isIdle;
 
+static const float sensitivity = 0.02;
+
 //-----------------------------------------------------------------------------
 // data
 //-----------------------------------------------------------------------------