diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/kourendlibrary/KourendLibraryOverlay.java b/runelite-client/src/main/java/net/runelite/client/plugins/kourendlibrary/KourendLibraryOverlay.java
index 2b40c99f95..fb60cb0262 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/kourendlibrary/KourendLibraryOverlay.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/kourendlibrary/KourendLibraryOverlay.java
@@ -138,7 +138,7 @@ class KourendLibraryOverlay extends Overlay
 				Color color = bookIsKnown ? Color.ORANGE : Color.WHITE;
 
 				// Render the poly on the floor
-				if (!(bookIsKnown && book == null) && (library.getState() == SolvedState.NO_DATA || book != null || !possible.isEmpty()) && !shouldHideOverlayIfDuplicateBook(book))
+				if (!(bookIsKnown && book == null) && (library.getState() == SolvedState.NO_DATA || book != null || !possible.isEmpty()) && shouldShowOverlayIfDuplicateBook(book))
 				{
 					Polygon poly = getCanvasTilePoly(client, localBookcase);
 					if (poly != null)
@@ -151,7 +151,7 @@ class KourendLibraryOverlay extends Overlay
 				// If the book is singled out, render the text and the book's icon
 				if (bookIsKnown)
 				{
-					if (book != null && !shouldHideOverlayIfDuplicateBook(book))
+					if (book != null && shouldShowOverlayIfDuplicateBook(book))
 					{
 						FontMetrics fm = g.getFontMetrics();
 						Rectangle2D bounds = fm.getStringBounds(book.getShortName(), g);
@@ -239,11 +239,11 @@ class KourendLibraryOverlay extends Overlay
 		return null;
 	}
 
-	private boolean shouldHideOverlayIfDuplicateBook(@Nullable Book book)
+	private boolean shouldShowOverlayIfDuplicateBook(@Nullable Book book)
 	{
-		return plugin.isHideDuplicateBook()
-			&& book != null
-			&& !book.isDarkManuscript()
-			&& plugin.doesPlayerContainBook(book);
+		return !plugin.isHideDuplicateBook()
+			|| book == null
+			|| book.isDarkManuscript()
+			|| !plugin.doesPlayerContainBook(book);
 	}
 }