diff --git a/src/omero/plugins/import.py b/src/omero/plugins/import.py
index a296950f7..7f73ce661 100644
--- a/src/omero/plugins/import.py
+++ b/src/omero/plugins/import.py
@@ -571,7 +571,7 @@ def _userdir_jars(self, parentonly=False):
             return None, omero_java_txt
 
     def download_omero_java(self, version_or_uri):
-        if re.match("^\w+://", version_or_uri):
+        if re.match(r"^\w+://", version_or_uri):
             omero_java_zip = version_or_uri
         else:
             omero_java_zip = OMERO_JAVA_ZIP.format(version=version_or_uri)