diff --git a/stumpwm/stumpwmrc b/stumpwm/stumpwmrc
index 2117bea..cdc932c 100644
--- a/stumpwm/stumpwmrc
+++ b/stumpwm/stumpwmrc
@@ -47,6 +47,9 @@
 ;; set DESKTOP_SESSION variable
 (setf (getenv "DESKTOP_SESSION") "stumpwm")
 
+;; bugfix for scrolling doesn't work with an external mouse in GTK+3 Apps
+(setf (getenv "GDK_CORE_DEVICE_EVENTS") "1")
+
 ;; style message windows
 (set-bg-color "#333333")
 (set-border-color "#b00045")