diff --git a/src/space/space.cpp b/src/space/space.cpp
index ca816f3..5ad6dba 100644
--- a/src/space/space.cpp
+++ b/src/space/space.cpp
@@ -1474,35 +1474,35 @@ void Space::serialize_to_space_to(std::wstring & str, bool pretty_print) const
 
 
 
-std::string Space::serialize_to_json_str() const
+std::string Space::serialize_to_json_str(bool pretty_print) const
 {
 	std::string str;
-	serialize_to_json_to(str);
+	serialize_to_json_to(str, pretty_print);
 	return str;
 }
 
 
-std::wstring Space::serialize_to_json_wstr() const
+std::wstring Space::serialize_to_json_wstr(bool pretty_print) const
 {
 	std::wstring str;
-	serialize_to_json_to(str);
+	serialize_to_json_to(str, pretty_print);
 	return str;
 }
 
 
-void Space::serialize_to_json_to(std::string & str) const
+void Space::serialize_to_json_to(std::string & str, bool pretty_print) const
 {
 	TextStream stream;
-	serialize_to_json_stream(stream);
+	serialize_to_json_stream(stream, pretty_print);
 
 	stream.to_str(str);
 }
 
 
-void Space::serialize_to_json_to(std::wstring & str) const
+void Space::serialize_to_json_to(std::wstring & str, bool pretty_print) const
 {
 	WTextStream stream;
-	serialize_to_json_stream(stream);
+	serialize_to_json_stream(stream, pretty_print);
 
 	stream.to_str(str);
 }
diff --git a/src/space/space.h b/src/space/space.h
index 02241d4..a943cee 100644
--- a/src/space/space.h
+++ b/src/space/space.h
@@ -555,10 +555,10 @@ public:
 
 
 
-	std::string  serialize_to_json_str() const;
-	std::wstring serialize_to_json_wstr() const;
-	void serialize_to_json_to(std::string & str) const;
-	void serialize_to_json_to(std::wstring & str) const;
+	std::string  serialize_to_json_str(bool pretty_print = false) const;
+	std::wstring serialize_to_json_wstr(bool pretty_print = false) const;
+	void serialize_to_json_to(std::string & str, bool pretty_print = false) const;
+	void serialize_to_json_to(std::wstring & str, bool pretty_print = false) const;
 
 
 	template<typename StreamType>