diff --git a/src/Palette/PaletteGrid.gd b/src/Palette/PaletteGrid.gd
index cd3a9cc05..8f32823e0 100644
--- a/src/Palette/PaletteGrid.gd
+++ b/src/Palette/PaletteGrid.gd
@@ -152,5 +152,5 @@ func convert_grid_index_to_palette_index(index: int) -> int:
 
 func convert_palette_index_to_grid_index(palette_index: int) -> int:
 	var x: int = palette_index % displayed_palette.width
-	var y: int = palette_index / displayed_palette.height
+	var y: int = palette_index / displayed_palette.width
 	return int((x - grid_window_origin.x) + (y - grid_window_origin.y) * grid_size.x)