diff --git a/squirrelbattle/mapgeneration/randomwalk.py b/squirrelbattle/mapgeneration/randomwalk.py
index 3acb58a..d4669d4 100644
--- a/squirrelbattle/mapgeneration/randomwalk.py
+++ b/squirrelbattle/mapgeneration/randomwalk.py
@@ -113,11 +113,11 @@ class Generator:
                         result.tiles[y][x] = Tile.WALL
         for x in range(width):
             for y in [0, height-1]:
-                if grid[y][x] = Tile.FLOOR:
+                if grid[y][x] == Tile.FLOOR:
                     grid[y][x] = Tile.WALL
         for y in range(height):
             for y in [0, width-1]:
-                if grid[y][x] = Tile.FLOOR:
+                if grid[y][x] == Tile.FLOOR:
                     grid[y][x] = Tile.WALL
 
         return result