Index: ImageMagick/trunk/coders/png.c
===================================================================
--- ImageMagick/trunk/coders/png.c	(revision 6627)
+++ ImageMagick/trunk/coders/png.c	(revision 6628)
@@ -11174,5 +11174,5 @@
         mng_info->write_png_compression_level = 1;
 
-      if (LocaleCompare(value,"1") == 0)
+      else if (LocaleCompare(value,"1") == 0)
         mng_info->write_png_compression_level = 2;