diff --git a/Xplat/src/main/java/vazkii/patchouli/client/book/gui/GuiBook.java b/Xplat/src/main/java/vazkii/patchouli/client/book/gui/GuiBook.java
index e3d5b3c8..e0e52c68 100644
--- a/Xplat/src/main/java/vazkii/patchouli/client/book/gui/GuiBook.java
+++ b/Xplat/src/main/java/vazkii/patchouli/client/book/gui/GuiBook.java
@@ -346,9 +346,9 @@ public boolean keyPressed(int keyCode, int scanCode, int modifiers) {
 
 	@Override
 	public boolean mouseScrolled(double mouseX, double mouseY, double scrollX, double scrollY) {
-		if (scrollX < 0) {
+		if (scrollX < 0 || scrollY < 0) {
 			changePage(false, true);
-		} else if (scrollX > 0) {
+		} else if (scrollX > 0 || scrollY > 0) {
 			changePage(true, true);
 		}