diff --git a/apps/doom_fire_psx2.py b/apps/doom_fire_psx2.py
index 0fe4c2f..0e2c826 100755
--- a/apps/doom_fire_psx2.py
+++ b/apps/doom_fire_psx2.py
@@ -57,8 +57,8 @@ colors = np.array([
 
 colors = np.reshape(colors, (colors.size//3, 3))
 
-grid = np.zeros((Ny,Nx), dtype=np.int)
-gridout = np.zeros((Ny,Nx), dtype=np.int)
+grid = np.zeros((Ny,Nx), dtype=np.int32)
+gridout = np.zeros((Ny,Nx), dtype=np.int32)
 grid[0,:].fill(colors.shape[0]-1)
 
 clock = pygame.time.Clock()