diff --git a/src/PIL/_imaging.pyi b/src/PIL/_imaging.pyi
index c5cff0094..10a42549b 100644
--- a/src/PIL/_imaging.pyi
+++ b/src/PIL/_imaging.pyi
@@ -20,13 +20,13 @@ def merge(mode: Mode, im1: ImagingCore, im2: ImagingCore=...,
 
 def map_buffer(target_data: Any, size: Size, decoder_name: Text,
                bbox: Optional[Any], offset: int, args: Tuple[Mode, int, int]
-	      ) -> ImagingCore: ...  ### what are data & bbox?
+               ) -> ImagingCore: ...  ### what are data & bbox?
 
 def crc32(buffer: bytes, hilo: Tuple[int, int]=(0,0)) -> Tuple[int, int]: ...
 
 def effect_mandelbrot(size: Size=(512,512),
                       extent: Tuple[float, float, float, float]=(-3,-2.5,2,2.5),
-		      quality: int=100) -> ImagingCore: ...
+                      quality: int=100) -> ImagingCore: ...
 def effect_noise(size: Size, sigma: float=128) -> ImagingCore: ...
 def linear_gradient(mode: Mode) -> ImagingCore: ...
 def radial_gradient(mode: Mode) -> ImagingCore: ...