diff --git a/contrib/libtests/pngvalid.c b/contrib/libtests/pngvalid.c
index c82c269fd..fa25e3961 100644
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
@@ -3307,10 +3307,10 @@ init_standard_palette(png_store *ps, png_structp pp, png_infop pi, int npalette,
       for (; i<256; ++i)
          tRNS[i] = 24;
 
-#     ifdef PNG_WRITE_tRNS_SUPPORTED
-         if (j > 0)
-            png_set_tRNS(pp, pi, tRNS, j, 0/*color*/);
-#     endif
+#ifdef PNG_WRITE_tRNS_SUPPORTED
+      if (j > 0)
+         png_set_tRNS(pp, pi, tRNS, j, 0/*color*/);
+#endif
    }
 }
 
@@ -7937,11 +7937,11 @@ image_transform_png_set_background_set(const image_transform *this,
    else
       back.gray = (png_uint_16)data.red;
 
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-      png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
-#  else
-      png_set_background_fixed(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
-#  endif
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
+#else
+   png_set_background_fixed(pp, &back, PNG_BACKGROUND_GAMMA_FILE, expand, 0);
+#endif
 
    this->next->set(this->next, that, pp, pi);
 }
diff --git a/pngget.c b/pngget.c
index ca44982a0..aafcd96c9 100644
--- a/pngget.c
+++ b/pngget.c
@@ -1142,19 +1142,19 @@ png_get_compression_buffer_size(png_const_structrp png_ptr)
       return 0;
 
 #ifdef PNG_WRITE_SUPPORTED
-      if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
+   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
 #endif
    {
 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-         return png_ptr->IDAT_read_size;
+      return png_ptr->IDAT_read_size;
 #else
-         return PNG_IDAT_READ_SIZE;
+      return PNG_IDAT_READ_SIZE;
 #endif
    }
 
 #ifdef PNG_WRITE_SUPPORTED
-      else
-         return png_ptr->zbuffer_size;
+   else
+      return png_ptr->zbuffer_size;
 #endif
 }
 
diff --git a/pngread.c b/pngread.c
index 614fcd19d..64114ef11 100644
--- a/pngread.c
+++ b/pngread.c
@@ -3848,16 +3848,16 @@ png_image_read_direct(png_voidp argument)
             else
                filler = 255;
 
-#           ifdef PNG_FORMAT_AFIRST_SUPPORTED
-               if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
-               {
-                  where = PNG_FILLER_BEFORE;
-                  change &= ~PNG_FORMAT_FLAG_AFIRST;
-               }
+#ifdef PNG_FORMAT_AFIRST_SUPPORTED
+            if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
+            {
+               where = PNG_FILLER_BEFORE;
+               change &= ~PNG_FORMAT_FLAG_AFIRST;
+            }
 
-               else
-#           endif
-               where = PNG_FILLER_AFTER;
+            else
+#endif
+            where = PNG_FILLER_AFTER;
 
             png_set_add_alpha(png_ptr, filler, where);
          }
@@ -3965,12 +3965,12 @@ png_image_read_direct(png_voidp argument)
       if (info_ptr->bit_depth == 16)
          info_format |= PNG_FORMAT_FLAG_LINEAR;
 
-#     ifdef PNG_FORMAT_BGR_SUPPORTED
-         if ((png_ptr->transformations & PNG_BGR) != 0)
-            info_format |= PNG_FORMAT_FLAG_BGR;
-#     endif
+#ifdef PNG_FORMAT_BGR_SUPPORTED
+      if ((png_ptr->transformations & PNG_BGR) != 0)
+         info_format |= PNG_FORMAT_FLAG_BGR;
+#endif
 
-#     ifdef PNG_FORMAT_AFIRST_SUPPORTED
+#ifdef PNG_FORMAT_AFIRST_SUPPORTED
          if (do_local_background == 2)
          {
             if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)