diff --git a/src/JSONValue.cpp b/src/JSONValue.cpp
index 80317b2..928354e 100644
--- a/src/JSONValue.cpp
+++ b/src/JSONValue.cpp
@@ -59,9 +59,9 @@ JSONValue *JSONValue::Parse(const char **data)
 	}
 
 	// Is it a boolean?
-	else if ((simplejson_wcsnlen(*data, 4) && strcasecmp(*data, "true") == 0) || (simplejson_wcsnlen(*data, 5) && strcasecmp(*data, "false") == 0))
+	else if ((simplejson_wcsnlen(*data, 4) && strncasecmp(*data, "true", 4) == 0) || (simplejson_wcsnlen(*data, 5) && strncasecmp(*data, "false", 5) == 0))
 	{
-		bool value = strcasecmp(*data, "true") == 0;
+		bool value = strncasecmp(*data, "true", 4) == 0;
 		(*data) += value ? 4 : 5;
 		return new JSONValue(value);
 	}