diff --git a/services/src/main/java/org/fao/geonet/api/registries/vocabularies/KeywordsApi.java b/services/src/main/java/org/fao/geonet/api/registries/vocabularies/KeywordsApi.java
index 5911513b9d8..137a7b30ef4 100644
--- a/services/src/main/java/org/fao/geonet/api/registries/vocabularies/KeywordsApi.java
+++ b/services/src/main/java/org/fao/geonet/api/registries/vocabularies/KeywordsApi.java
@@ -812,7 +812,7 @@ public String uploadThesaurus(
                 Log.debug(Geonet.THESAURUS, "Uploading thesaurus: " + fname);
 
                 // Rename .xml to .rdf for all thesaurus
-                fname = fname.replaceAll(Pattern.quote(extension), "rdf");
+                fname = fname.replace(extension, "rdf");
                 uploadThesaurus(rdfFile,
                     getStylesheetForExtension(stylesheet, extension),
                     context, fname, type.toString(), dir);