diff --git a/lix/libutil/chunked-vector.hh b/lix/libutil/chunked-vector.hh
index d8cabef1f..3e5019575 100644
--- a/lix/libutil/chunked-vector.hh
+++ b/lix/libutil/chunked-vector.hh
@@ -37,7 +37,7 @@ private:
     }
 
 public:
-    ChunkedVector(uint32_t reserve)
+    ChunkedVector(uint32_t reserve = 1)
     {
         chunks.reserve(reserve);
         addChunk();