diff --git a/src/main/webapp/WEB-INF/crawler/resources/app.xml b/src/main/webapp/WEB-INF/crawler/resources/app.xml
index 727203955..76fb2f4ea 100644
--- a/src/main/webapp/WEB-INF/crawler/resources/app.xml
+++ b/src/main/webapp/WEB-INF/crawler/resources/app.xml
@@ -94,15 +94,15 @@
 			<arg>"pdf"</arg>
 		</postConstruct>
 		<postConstruct name="add">
-			<arg>"application/x-fictionbook+xml</arg>
+			<arg>"application/x-fictionbook+xml"</arg>
 			<arg>"fb2"</arg>
 		</postConstruct>
 		<postConstruct name="add">
-			<arg>"application/e-pub+zip</arg>
+			<arg>"application/e-pub+zip"</arg>
 			<arg>"epub"</arg>
 		</postConstruct>
 		<postConstruct name="add">
-			<arg>"application/x-ibooks+zip</arg>
+			<arg>"application/x-ibooks+zip"</arg>
 			<arg>"ibooks"</arg>
 		</postConstruct>
 	</component>