diff --git a/library/server/wsf/wsf-safe.ecf b/library/server/wsf/wsf-safe.ecf
index efeb0034..7cf1b0bf 100644
--- a/library/server/wsf/wsf-safe.ecf
+++ b/library/server/wsf/wsf-safe.ecf
@@ -15,6 +15,7 @@
 		<library name="error" location="..\..\utility\general\error\error-safe.ecf"/>
 		<library name="ewsgi" location="..\ewsgi\ewsgi-safe.ecf"/>
 		<library name="http" location="..\..\network\protocol\http\http-safe.ecf"/>
+		<library name="conneg" location="..\..\network\protocol\content_negotiation\conneg-safe.ecf"/>
 		<library name="time" location="$ISE_LIBRARY\library\time\time-safe.ecf"/>
 		<library name="uri" location="$ISE_LIBRARY\library\text\uri\uri-safe.ecf"/>
 		<library name="uri_template" location="..\..\text\parser\uri_template\uri_template-safe.ecf"/>
diff --git a/library/server/wsf/wsf.ecf b/library/server/wsf/wsf.ecf
index b8088db3..5f0269d8 100644
--- a/library/server/wsf/wsf.ecf
+++ b/library/server/wsf/wsf.ecf
@@ -15,6 +15,7 @@
 		<library name="time" location="$ISE_LIBRARY\library\time\time.ecf"/>
 		<library name="error" location="../../utility/general/error/error.ecf"/>
 		<library name="http" location="../../network/protocol/http/http.ecf"/>
+		<library name="conneg" location="..\..\network\protocol\content_negotiation\conneg.ecf"/>
 		<library name="uri_template"
 			 location="../../text/parser/uri_template/uri_template.ecf"/>
 		<library name="encoder"