diff --git a/ChangeLog b/ChangeLog
index 4ec95d5178c61e180fad3b57bf801df93a8bb68e..15d9bd64cdd8426def9203463c463d028f679e4f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2005-09-03  Michael Natterer  <mitch@gimp.org>
+
+	* app/base/temp-buf.c (temp_buf_resize): do new_size calculation
+	only when needed.
+
 2005-09-03  Michael Natterer  <mitch@gimp.org>
 
 	* app/paint/gimppaintcore.c (gimp_paint_core_get_orig_image)
diff --git a/app/base/temp-buf.c b/app/base/temp-buf.c
index e957e2385728820ff93cf189fde038679483cbf6..0bea61e448e44911f0aec151ca6e40cf157cc5aa 100644
--- a/app/base/temp-buf.c
+++ b/app/base/temp-buf.c
@@ -317,26 +317,23 @@ temp_buf_resize (TempBuf *buf,
 		 gint     width,
 		 gint     height)
 {
-  gint size;
-
   g_return_val_if_fail (width > 0 && height > 0, NULL);
 
-  /*  calculate the requested size  */
-  size = width * height * bytes;
-
-  /*  First, configure the canvas buffer  */
-  if (!buf)
+  if (! buf)
     {
       buf = temp_buf_new (width, height, bytes, x, y, NULL);
     }
   else
     {
-      if (size != (buf->width * buf->height * buf->bytes))
+      gint new_size;
+
+      new_size = width * height * bytes;
+
+      if (new_size != (buf->width * buf->height * buf->bytes))
         {
-          buf->data = g_renew (guchar, buf->data, size);
+          buf->data = g_renew (guchar, buf->data, new_size);
         }
 
-      /*  Make sure the temp buf fields are valid  */
       buf->x      = x;
       buf->y      = y;
       buf->width  = width;