diff --git a/libwccl/ops/matchrule.h b/libwccl/ops/matchrule.h
index ff131b84de316a8e3631ff938e91f78ae9e60b1e..290590ee66be1b67567eb0c8775df220df733c44 100644
--- a/libwccl/ops/matchrule.h
+++ b/libwccl/ops/matchrule.h
@@ -2,6 +2,7 @@
 #define LIBWCCL_OPS_MATCHRULE_H
 
 #include <libwccl/ops/parsedexpression.h>
+#include <libcorpus2/ann/annotatedsentence.h>
 
 namespace Wccl {