diff --git a/filters/xsltfilter/export/xsltproc.cpp b/filters/xsltfilter/export/xsltproc.cpp
index 3bd20408a..d252cdcd6 100644
--- a/filters/xsltfilter/export/xsltproc.cpp
+++ b/filters/xsltfilter/export/xsltproc.cpp
@@ -287,7 +287,11 @@ int XSLTProc::parse()
      * disable CDATA from being built in the document tree
      */
     xmlDefaultSAXHandlerInit();
+#if LIBXML_VERSION < 21300
+    // In 2.13.0 this global variable was made constant and claimed that
+    // it "hasn't had an effect for a long time"
     xmlDefaultSAXHandler.cdataBlock = NULL;
+#endif // LIBXML_VERSION
 
     if ((cur != NULL) && (cur->errors == 0))
 	{
diff --git a/filters/xsltfilter/import/xsltproc.cpp b/filters/xsltfilter/import/xsltproc.cpp
index 3bd20408a..d252cdcd6 100644
--- a/filters/xsltfilter/import/xsltproc.cpp
+++ b/filters/xsltfilter/import/xsltproc.cpp
@@ -287,7 +287,11 @@ int XSLTProc::parse()
      * disable CDATA from being built in the document tree
      */
     xmlDefaultSAXHandlerInit();
+#if LIBXML_VERSION < 21300
+    // In 2.13.0 this global variable was made constant and claimed that
+    // it "hasn't had an effect for a long time"
     xmlDefaultSAXHandler.cdataBlock = NULL;
+#endif // LIBXML_VERSION
 
     if ((cur != NULL) && (cur->errors == 0))
 	{