diff --git a/gmagick_helpers.c b/gmagick_helpers.c
index 88aab56..5e9d578 100644
--- a/gmagick_helpers.c
+++ b/gmagick_helpers.c
@@ -185,6 +185,7 @@ void php_gmagick_initialize_constants()
 	GMAGICK_REGISTER_CONST_LONG("COMPRESSION_JBIG2", JBIG2Compression);
 #endif
  
+	GMAGICK_REGISTER_CONST_LONG("INTERLACE_NO", NoInterlace); //Don't interlace image (RGBRGBRGBRGBRGBRGB...)
 	GMAGICK_REGISTER_CONST_LONG("INTERLACE_NONE", NoInterlace); //Don't interlace image (RGBRGBRGBRGBRGBRGB...)
 	GMAGICK_REGISTER_CONST_LONG("INTERLACE_LINE", LineInterlace); //Use scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...)
 	GMAGICK_REGISTER_CONST_LONG("INTERLACE_PLANE", PlaneInterlace);//Use plane interlacing (RRRRRR...GGGGGG...BBBBBB...)