diff --git a/deps/limonp/StdExtension.hpp b/deps/limonp/StdExtension.hpp
index bc8abdb..e662172 100644
--- a/deps/limonp/StdExtension.hpp
+++ b/deps/limonp/StdExtension.hpp
@@ -29,6 +29,7 @@ using std::tr1::unordered_set;
 #include <fstream>
 #include <sstream>
 
+#define print(x) std::cout << x << std::endl
 
 namespace std {
 
diff --git a/deps/limonp/StringUtil.hpp b/deps/limonp/StringUtil.hpp
index 3d8001e..7e54011 100644
--- a/deps/limonp/StringUtil.hpp
+++ b/deps/limonp/StringUtil.hpp
@@ -80,7 +80,7 @@ inline string& Lower(string& str) {
 
 inline bool IsSpace(unsigned c) {
   // when passing large int as the argument of isspace, it core dump, so here need a type cast.
-  return c > 0xff ? false : std::isspace(c & 0xff);
+  return c > 0xff ? false : std::isspace(c & 0xff) != 0;
 }
 
 inline std::string& LTrim(std::string &s) {