diff --git a/deploy/to_price.sql b/deploy/to_price.sql
index 6ccde34..6bc6b0f 100644
--- a/deploy/to_price.sql
+++ b/deploy/to_price.sql
@@ -28,6 +28,7 @@ comment on function to_price(integer, integer) is
 'Converts the cents to a price representation, without currency and any other separater than decimal.';
 
 revoke execute on function to_price(integer, integer) from public;
+grant execute on function to_price(integer, integer) to guest;
 grant execute on function to_price(integer, integer) to employee;
 grant execute on function to_price(integer, integer) to admin;
 
diff --git a/test/to_price.sql b/test/to_price.sql
index 1d1d701..3374a63 100644
--- a/test/to_price.sql
+++ b/test/to_price.sql
@@ -14,7 +14,7 @@ select function_lang_is('camper', 'to_price', array ['integer', 'integer'], 'plp
 select function_returns('camper', 'to_price', array ['integer', 'integer'], 'text');
 select isnt_definer('camper', 'to_price', array ['integer', 'integer']);
 select volatility_is('camper', 'to_price', array ['integer', 'integer'], 'immutable');
-select function_privs_are('camper', 'to_price', array ['integer', 'integer'], 'guest', array []::text[]);
+select function_privs_are('camper', 'to_price', array ['integer', 'integer'], 'guest', array ['EXECUTE']);
 select function_privs_are('camper', 'to_price', array ['integer', 'integer'], 'employee', array ['EXECUTE']);
 select function_privs_are('camper', 'to_price', array ['integer', 'integer'], 'admin', array ['EXECUTE']);
 select function_privs_are('camper', 'to_price', array ['integer', 'integer'], 'authenticator', array []::text[]);