diff --git a/xorp/policy/backend/backend.ll b/xorp/policy/backend/backend.ll
index 1c72ac85b..0dc329ff3 100644
--- a/xorp/policy/backend/backend.ll
+++ b/xorp/policy/backend/backend.ll
@@ -111,7 +111,7 @@ void yyerror(const char *m)
         ostringstream oss;
 
         oss << "Error on line " <<  _parser_lineno << " near (";
-        for(int i = 0; i < yyleng; i++)
+        for(yy_size_t i = 0; i < yyleng; i++)
                 oss << yytext[i];
         oss << "): " << m;
 
diff --git a/xorp/policy/policy.ll b/xorp/policy/policy.ll
index 94651def9..a8be14451 100644
--- a/xorp/policy/policy.ll
+++ b/xorp/policy/policy.ll
@@ -218,7 +218,7 @@ void yyerror(const char *m)
         ostringstream oss;
         oss << "Error on line " <<  _parser_lineno << " near (";
 
-	for(int i = 0; i < yyleng; i++)
+	for(size_t i = 0; i < yyleng; i++)
 		oss << yytext[i];
 	oss << "): " << m;