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-rw-r--r--src/sim/mathexpr.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/sim/mathexpr.hh b/src/sim/mathexpr.hh
index d857fa512..6d04d2538 100644
--- a/src/sim/mathexpr.hh
+++ b/src/sim/mathexpr.hh
@@ -41,6 +41,7 @@
#define __SIM_MATHEXPR_HH__
#include <algorithm>
+#include <functional>
#include <string>
class MathExpr {