diff --git a/reco/littrack/parallel/LitFieldSlice.h b/reco/littrack/parallel/LitFieldSlice.h
index db491141018be3e3ae7c852bf37e63ce528e8575..d8d974334a5c98b3d262645dfec37bfbf38b5ac1 100644
--- a/reco/littrack/parallel/LitFieldSlice.h
+++ b/reco/littrack/parallel/LitFieldSlice.h
@@ -10,6 +10,8 @@
 
 #include "LitFieldValue.h"
 
+#include <vector>
+
 namespace lit {
   namespace parallel {