diff --git a/.pam_environment b/.pam_environment
index ed7c7fb..ef134aa 100644
--- a/.pam_environment
+++ b/.pam_environment
@@ -13,6 +13,7 @@ GTK2_RC_FILES	DEFAULT=${XDG_CONFIG_HOME}/gtk-2.0/gtkrc
 
 # qt5
 QT_QPA_PLATFORMTHEME	DEFAULT=qt5ct
+QT_AUTO_SCREEN_SCALE_FACTOR	DEFAULT=0
 
 # fcitx
 GTK_IM_MODULE	DEFAULT=fcitx