diff --git a/hprint.cpp b/hprint.cpp
index 7c115475..6fcb5982 100644
--- a/hprint.cpp
+++ b/hprint.cpp
@@ -211,6 +211,8 @@ struct comma_printer {
 template<class T, size_t X> void print(hstream& hs, const array<T, X>& a) { print(hs, "("); comma_printer c(hs); for(const T& t: a) c(t); print(hs, ")"); }
 template<class T> void print(hstream& hs, const vector<T>& a) { print(hs, "("); comma_printer c(hs); for(const T& t: a) c(t); print(hs, ")"); }
 
+template<class T, class U> void print(hstream& hs, const map<T,U>& a) { print(hs, "("); comma_printer c(hs); for(auto& t: a) c(t); print(hs, ")"); }
+
 inline void print(hstream& hs, const hyperpoint h) { print(hs, (const array<ld, MAXMDIM>&)h); }
 inline void print(hstream& hs, const transmatrix T) { 
   print(hs, "("); comma_printer c(hs);