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-rw-r--r--interface/opt.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/interface/opt.cc b/interface/opt.cc
index 42dfcb3..d129173 100644
--- a/interface/opt.cc
+++ b/interface/opt.cc
@@ -1,5 +1,6 @@
#include "opt.h"
#include <utilities/opt_types.hpp>
+#include <core/num_diff.hpp>
#include <models/models.hpp>
#include <map>
#include <core/freeze_param.hpp>