diff --git a/src/util/AllocatedString.hxx b/src/util/AllocatedString.hxx
index dbc0abfc0..97975f8b8 100644
--- a/src/util/AllocatedString.hxx
+++ b/src/util/AllocatedString.hxx
@@ -89,6 +89,10 @@ public:
 		return value;
 	}
 
+	bool empty() const {
+		return *value == 0;
+	}
+
 	pointer Steal() {
 		pointer result = value;
 		value = nullptr;