--- ext/curb_errors.c~	2012-11-03 10:16:53.146678744 +0800
+++ ext/curb_errors.c	2012-11-03 10:17:33.557684120 +0800
@@ -459,7 +459,7 @@
 /* rb_raise an approriate exception for the supplied CURLcode */
 void raise_curl_easy_error_exception(CURLcode code) {
   VALUE obj = rb_curl_easy_error(code);
-  rb_raise(rb_ary_entry(obj,0), RSTRING_PTR(rb_ary_entry(obj,1)));
+  rb_raise(rb_ary_entry(obj,0), "%s", RSTRING_PTR(rb_ary_entry(obj,1)));
 }
 VALUE rb_curl_multi_error(CURLMcode code) {
   VALUE exclz;
@@ -509,7 +509,7 @@
 }
 void raise_curl_multi_error_exception(CURLMcode code) {
   VALUE obj = rb_curl_multi_error(code);
-  rb_raise(rb_ary_entry(obj,0), RSTRING_PTR(rb_ary_entry(obj,1)));
+  rb_raise(rb_ary_entry(obj,0), "%s", RSTRING_PTR(rb_ary_entry(obj,1)));
 }
 
 void init_curb_errors() {