diff --git a/ANNOUNCE b/ANNOUNCE
index a24b0ed2..6c93a125 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -46,6 +46,7 @@ version 1.2.41beta01 [September 25, 2009]
   Moved redundant IHDR checking into new png_check_IHDR() in png.c
     and report all errors found in the IHDR data.
   Eliminated useless call to png_check_cHRM() from pngset.c
+  Expanded TAB characters in pngrtran.c
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
diff --git a/CHANGES b/CHANGES
index 8afcb373..5e7a97ec 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2476,6 +2476,7 @@ version 1.2.41beta01 [September 25, 2009]
   Moved redundant IHDR checking into new png_check_IHDR() in png.c
     and report all errors found in the IHDR data.
   Eliminated useless call to png_check_cHRM() from pngset.c
+  Expanded TAB characters in pngrtran.c
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/pngrtran.c b/pngrtran.c
index d7e6b4a9..1f000dab 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -990,14 +990,14 @@ png_init_read_transformations(png_structp png_ptr)
                   palette[i].blue = png_ptr->gamma_table[palette[i].blue];
                }
             }
-	    /* Prevent the transformations being done again, and make sure
-	     * that the now spurious alpha channel is stripped - the code
-	     * has just reduced background composition and gamma correction
-	     * to a simple alpha channel strip.
-	     */
-	    png_ptr->transformations &= ~PNG_BACKGROUND;
-	    png_ptr->transformations &= ~PNG_GAMMA;
-	    png_ptr->transformations |= PNG_STRIP_ALPHA;
+            /* Prevent the transformations being done again, and make sure
+             * that the now spurious alpha channel is stripped - the code
+             * has just reduced background composition and gamma correction
+             * to a simple alpha channel strip.
+             */
+            png_ptr->transformations &= ~PNG_BACKGROUND;
+            png_ptr->transformations &= ~PNG_GAMMA;
+            png_ptr->transformations |= PNG_STRIP_ALPHA;
          }
          /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
          else
@@ -1075,8 +1075,8 @@ png_init_read_transformations(png_structp png_ptr)
             palette[i].blue = png_ptr->gamma_table[palette[i].blue];
          }
 
-	 /* Done the gamma correction. */
-	 png_ptr->transformations &= ~PNG_GAMMA;
+         /* Done the gamma correction. */
+         png_ptr->transformations &= ~PNG_GAMMA;
       }
    }
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)