diff --git a/tools/sigma/backends/splunk.py b/tools/sigma/backends/splunk.py
index a2db0261a..c537cb6c4 100644
--- a/tools/sigma/backends/splunk.py
+++ b/tools/sigma/backends/splunk.py
@@ -18,6 +18,8 @@ import re
 import sigma
 from .base import SingleTextQueryBackend
 from .mixins import MultiRuleOutputMixin
+from sigma.parser.modifiers.type import SigmaRegularExpressionModifier
+
 
 class SplunkBackend(SingleTextQueryBackend):
     """Converts Sigma rule into Splunk Search Processing Language (SPL)."""