diff --git a/valid.c b/valid.c
index 9628dff..4a978c3 100644
--- a/valid.c
+++ b/valid.c
@@ -371,7 +371,7 @@
 
 static void
 xmlValidDebug(xmlNodePtr cur, xmlElementContentPtr cont) {
-    char expr[1000];
+    char expr[5000];
 
     expr[0] = 0;
     xmlGenericError(xmlGenericErrorContext, "valid: ");