diff --git a/src/native/linux/org_lwjgl_input_Mouse.c b/src/native/linux/org_lwjgl_input_Mouse.c
index c7df6026..9df0fdad 100644
--- a/src/native/linux/org_lwjgl_input_Mouse.c
+++ b/src/native/linux/org_lwjgl_input_Mouse.c
@@ -302,7 +302,7 @@ void handleButtonPress(XButtonEvent *event) {
 		default: 
 			break;
 	}
-	dz += delta;
+	accum_dz += delta;
 	handleButton(event, 1);
 }