diff --git a/ext/xmlparser.c b/ext/xmlparser.c
index aa32d11..65a6540 100644
--- a/ext/xmlparser.c
+++ b/ext/xmlparser.c
@@ -1780,7 +1780,7 @@ XMLParser_parse(int argc, VALUE* argv, VALUE obj)
       if (!ret) {
 	int err = XML_GetErrorCode(parser->parser);
 	const char* errStr = XML_ErrorString(err);
-	rb_raise(eXMLParserError, (char*)errStr);
+	rb_raise(eXMLParserError, "%s", errStr);
       }
     } while (!NIL_P(buf));
     return Qnil;
@@ -1829,7 +1829,7 @@ XMLParser_parse(int argc, VALUE* argv, VALUE obj)
   if (!ret) {
     int err = XML_GetErrorCode(parser->parser);
     const char* errStr = XML_ErrorString(err);
-    rb_raise(eXMLParserError, (char*)errStr);
+    rb_raise(eXMLParserError, "%s", errStr);
   }
 
   return Qnil;