diff --git a/wrap/nanoply/include/nanoply.hpp b/wrap/nanoply/include/nanoply.hpp
index d35473a6..5a213560 100644
--- a/wrap/nanoply/include/nanoply.hpp
+++ b/wrap/nanoply/include/nanoply.hpp
@@ -30,6 +30,7 @@
 #include <sstream>
 #include <stdint.h>
 #include <string>
+#include <iomanip>
 
 
 // Avoid conflicting declaration of min/max macros in windows headers