diff --git a/gtsam/base/DSFMap.h b/gtsam/base/DSFMap.h
index 6d0fbca20..3a9d21aad 100644
--- a/gtsam/base/DSFMap.h
+++ b/gtsam/base/DSFMap.h
@@ -21,6 +21,7 @@
 #include <cstdlib>  // Provides size_t
 #include <map>
 #include <set>
+#include <vector>
 
 namespace gtsam {