diff --git a/code/__DEFINES/_click.dm b/code/__DEFINES/_click.dm
index 07d044f8b89..08507a4dff9 100644
--- a/code/__DEFINES/_click.dm
+++ b/code/__DEFINES/_click.dm
@@ -5,6 +5,8 @@
 #define RIGHT_CLICK "right"
 #define MIDDLE_CLICK "middle"
 #define LEFT_CLICK "left"
+#define BUTTON4 "xbutton1"
+#define BUTTON5 "xbutton2"
 
 ///Mouse button that was just clicked/released
 ///if(modifiers[BUTTON] == LEFT_CLICK)
diff --git a/code/_onclick/click.dm b/code/_onclick/click.dm
index 0981c6f2518..1b015ea2efd 100644
--- a/code/_onclick/click.dm
+++ b/code/_onclick/click.dm
@@ -76,6 +76,9 @@
 	if(SEND_SIGNAL(src, COMSIG_MOB_CLICKON, A, modifiers) & COMSIG_MOB_CANCEL_CLICKON)
 		return
 
+	if(LAZYACCESS(modifiers, BUTTON4) || LAZYACCESS(modifiers, BUTTON5))
+		return
+
 	if(LAZYACCESS(modifiers, SHIFT_CLICK))
 		if(LAZYACCESS(modifiers, MIDDLE_CLICK))
 			ShiftMiddleClickOn(A)