diff --git a/xml/relaxng/src/org/intellij/html/RelaxedHtmlFromRngNSDescriptor.java b/xml/relaxng/src/org/intellij/html/RelaxedHtmlFromRngNSDescriptor.java
index 8724b3eabf63..984f50d0ec5a 100644
--- a/xml/relaxng/src/org/intellij/html/RelaxedHtmlFromRngNSDescriptor.java
+++ b/xml/relaxng/src/org/intellij/html/RelaxedHtmlFromRngNSDescriptor.java
@@ -37,10 +37,12 @@ public class RelaxedHtmlFromRngNSDescriptor extends RngNsDescriptor implements R
   public XmlElementDescriptor getElementDescriptor(@NotNull XmlTag tag) {
     XmlElementDescriptor elementDescriptor = super.getElementDescriptor(tag);
 
-    LOG.debug("Descriptor from rng for tag " +
-              tag.getName() +
-              " is " +
-              (elementDescriptor != null ? elementDescriptor.getClass().getCanonicalName() : "NULL"));
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("Descriptor from rng for tag " +
+                tag.getName() +
+                " is " +
+                (elementDescriptor != null ? elementDescriptor.getClass().getCanonicalName() : "NULL"));
+    }
 
     String namespace;
     if (elementDescriptor == null &&