diff --git a/libImaging/File.c b/libImaging/File.c
index ac9ec3be1..b669ab665 100644
--- a/libImaging/File.c
+++ b/libImaging/File.c
@@ -30,26 +30,26 @@ ImagingOpenPPM(const char* infile)
     Imaging im;
 
     if (!infile)
-	return ImagingError_ValueError(NULL);
+        return ImagingError_ValueError(NULL);
 
     fp = fopen(infile, "rb");
     if (!fp)
-	return ImagingError_IOError();
+        return ImagingError_IOError();
 
     /* PPM magic */
     if (fgetc(fp) != 'P')
-	goto error;
+        goto error;
     switch (fgetc(fp)) {
     case '4': /* FIXME: 1-bit images are not yet supported */
-	goto error;
+        goto error;
     case '5':
-	mode = "L";
-	break;
+        mode = "L";
+        break;
     case '6':
-	mode = "RGB";
-	break;
+        mode = "RGB";
+        break;
     default:
-	goto error;
+        goto error;
     }
 
     i = 0;
@@ -59,66 +59,66 @@ ImagingOpenPPM(const char* infile)
 
     while (i < 3) {
 
-	/* Ignore optional comment fields */
-	while (c == '\n') {
-	    c = fgetc(fp);
-	    if (c == '#') {
-		do {
-		    c = fgetc(fp);
-		    if (c == EOF)
-			goto error;
-		} while (c != '\n');
-		c = fgetc(fp);
-	    }
-	}
+        /* Ignore optional comment fields */
+        while (c == '\n') {
+            c = fgetc(fp);
+            if (c == '#') {
+                do {
+                    c = fgetc(fp);
+                    if (c == EOF)
+                        goto error;
+                } while (c != '\n');
+                c = fgetc(fp);
+            }
+        }
 
-	/* Skip forward to next value */
-	while (isspace(c))
-	    c = fgetc(fp);
+        /* Skip forward to next value */
+        while (isspace(c))
+            c = fgetc(fp);
 
-	/* And parse it */
-	v = 0;
-	while (isdigit(c)) {
-	    v = v * 10 + (c - '0');
-	    c = fgetc(fp);
-	}
+        /* And parse it */
+        v = 0;
+        while (isdigit(c)) {
+            v = v * 10 + (c - '0');
+            c = fgetc(fp);
+        }
 
-	if (c == EOF)
-	    goto error;
+        if (c == EOF)
+            goto error;
 
-	switch (i++) {
-	case 0:
-	    x = v;
-	    break;
-	case 1:
-	    y = v;
-	    break;
-	case 2:
-	    max = v;
-	    break;
-	}
+        switch (i++) {
+        case 0:
+            x = v;
+            break;
+        case 1:
+            y = v;
+            break;
+        case 2:
+            max = v;
+            break;
+        }
     }
 
     im = ImagingNew(mode, x, y);
     if (!im)
-	return NULL;
+        return NULL;
 
     /* if (max != 255) ... FIXME: does anyone ever use this feature? */
 
     if (strcmp(im->mode, "L") == 0) {
 
-	/* PPM "L" */
-	for (y = 0; y < im->ysize; y++)
-	    if (fread(im->image[y], im->xsize, 1, fp) != 1)
-		goto error;
+        /* PPM "L" */
+        for (y = 0; y < im->ysize; y++)
+            if (fread(im->image[y], im->xsize, 1, fp) != 1)
+                goto error;
 
     } else {
 
-	/* PPM "RGB" or PyPPM mode */
-	for (y = 0; y < im->ysize; y++)
-	    for (x = i = 0; x < im->xsize; x++, i += im->pixelsize)
-		if (fread(im->image[y]+i, im->bands, 1, fp) != 1)
-		    goto error;
+        /* PPM "RGB" or PyPPM mode */
+        for (y = 0; y < im->ysize; y++)
+            for (x = i = 0; x < im->xsize; x++, i += im->pixelsize)
+                if (fread(im->image[y]+i, im->bands, 1, fp) != 1)
+                    goto error;
     }
 
     fclose(fp);
@@ -140,16 +140,16 @@ ImagingSaveRaw(Imaging im, FILE* fp)
 
         /* @PIL227: FIXME: for mode "1", map != 0 to 255 */
 
-	/* PGM "L" */
-	for (y = 0; y < im->ysize; y++)
-	    fwrite(im->image[y], 1, im->xsize, fp);
+        /* PGM "L" */
+        for (y = 0; y < im->ysize; y++)
+            fwrite(im->image[y], 1, im->xsize, fp);
 
     } else {
 
-	/* PPM "RGB" or other internal format */
-	for (y = 0; y < im->ysize; y++)
-	    for (x = i = 0; x < im->xsize; x++, i += im->pixelsize)
-		fwrite(im->image[y]+i, 1, im->bands, fp);
+        /* PPM "RGB" or other internal format */
+        for (y = 0; y < im->ysize; y++)
+            for (x = i = 0; x < im->xsize; x++, i += im->pixelsize)
+                fwrite(im->image[y]+i, 1, im->bands, fp);
 
     }
 
@@ -163,24 +163,24 @@ ImagingSavePPM(Imaging im, const char* outfile)
     FILE* fp;
 
     if (!im) {
-	(void) ImagingError_ValueError(NULL);
-	return 0;
+        (void) ImagingError_ValueError(NULL);
+        return 0;
     }
 
     fp = fopen(outfile, "wb");
     if (!fp) {
-	(void) ImagingError_IOError();
-	return 0;
+        (void) ImagingError_IOError();
+        return 0;
     }
 
     if (strcmp(im->mode, "1") == 0 || strcmp(im->mode, "L") == 0) {
-	/* Write "PGM" */
-	fprintf(fp, "P5\n%d %d\n255\n", im->xsize, im->ysize);
+        /* Write "PGM" */
+        fprintf(fp, "P5\n%d %d\n255\n", im->xsize, im->ysize);
     } else if (strcmp(im->mode, "RGB") == 0) {
         /* Write "PPM" */
         fprintf(fp, "P6\n%d %d\n255\n", im->xsize, im->ysize);
     } else {
-	(void) ImagingError_ModeError();
+        (void) ImagingError_ModeError();
         return 0;
     }