diff --git a/src/vs/editor/browser/gpu/atlas/textureAtlasSlabAllocator.ts b/src/vs/editor/browser/gpu/atlas/textureAtlasSlabAllocator.ts
index b41fed6978c..461fd507dbe 100644
--- a/src/vs/editor/browser/gpu/atlas/textureAtlasSlabAllocator.ts
+++ b/src/vs/editor/browser/gpu/atlas/textureAtlasSlabAllocator.ts
@@ -55,7 +55,7 @@ export class TextureAtlasSlabAllocator implements ITextureAtlasAllocator {
 		}));
 
 		this._slabW = Math.min(
-			options?.slabW ?? (64 << (Math.floor(getActiveWindow().devicePixelRatio) - 1)),
+			options?.slabW ?? (64 << Math.max(Math.floor(getActiveWindow().devicePixelRatio) - 1, 0)),
 			this._canvas.width
 		);
 		this._slabH = Math.min(