diff --git a/ghostery/validate-dnr-rules/src/stubs.cpp b/ghostery/validate-dnr-rules/src/stubs.cpp
index ed07bc7ff36a..57946c1a975f 100644
--- a/ghostery/validate-dnr-rules/src/stubs.cpp
+++ b/ghostery/validate-dnr-rules/src/stubs.cpp
@@ -33,17 +33,17 @@ namespace JSC::Yarr {
 
 bool characterClassMayContainStrings(BuiltInCharacterClassID)
 {
-    return false;
+    std::abort();
 }
 
 std::optional<BuiltInCharacterClassID> unicodeMatchProperty(WTF::String, CompileMode)
 {
-    return std::nullopt;
+    std::abort();
 }
 
 std::optional<BuiltInCharacterClassID> unicodeMatchPropertyValue(WTF::String, WTF::String)
 {
-    return std::nullopt;
+    std::abort();
 }
 
 } // namespace JSC::Yarr