diff --git a/extract_svg_layers.xsl b/extract_svg_layers.xsl
index 704089d..ef3a570 100755
--- a/extract_svg_layers.xsl
+++ b/extract_svg_layers.xsl
@@ -115,7 +115,7 @@
 	<xsl:template name="ignore-layers"
 		match="svg:g[ ( @inkscape:groupmode = 'layer' ) and
 					  ( $layers != '*') and
-					  not( contains ( $layers, @inkscape:label ) )
+					  not( contains ( lower-case( $layers ), lower-case( @inkscape:label ) ) )
 					]" />