diff --git a/icetime/icetime.cc b/icetime/icetime.cc
index cc37625..0735b00 100644
--- a/icetime/icetime.cc
+++ b/icetime/icetime.cc
@@ -30,6 +30,7 @@
 #include <functional>
 #include <map>
 #include <set>
+#include <stdexcept>
 #include <string>
 #include <tuple>
 #include <vector>