diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index 9ef7bc4..118c60d 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -538,7 +538,7 @@ void XMLUtil::ToStr( unsigned v, char* buffer, int bufferSize )
 
 void XMLUtil::ToStr( bool v, char* buffer, int bufferSize )
 {
-    TIXML_SNPRINTF( buffer, bufferSize, "%d", v ? 1 : 0 );
+    TIXML_SNPRINTF( buffer, bufferSize, "%s", v ? "true" : "false" );
 }
 
 /*