diff --git a/src/naming/asserts.cairo b/src/naming/asserts.cairo
index 5196863..df346b0 100644
--- a/src/naming/asserts.cairo
+++ b/src/naming/asserts.cairo
@@ -37,7 +37,7 @@ impl AssertionsImpl of AssertionsTrait {
         assert(data.owner == 0 || data.expiry < now, 'unexpired domain');
 
         // Verify expiration range
-        assert(days < 365 * 25, 'max purchase of 25 years');
+        assert(days <= 365 * 25, 'max purchase of 25 years');
         assert(days > 2 * 30, 'min purchase of 2 month');
         return (hashed_domain, now, now + 86400 * days.into());
     }
diff --git a/src/naming/main.cairo b/src/naming/main.cairo
index 24ec301..de43c95 100644
--- a/src/naming/main.cairo
+++ b/src/naming/main.cairo
@@ -383,8 +383,8 @@ mod Naming {
                 domain_data.expiry + 86400 * days.into()
             };
             // 25*365 = 9125
-            assert(new_expiry <= now + 86400 * 9125, 'purchase too long');
-            assert(days >= 6 * 30, 'purchase too short');
+            assert(new_expiry <= now + 365 * 25 * 86400, 'max purchase of 25 years');
+            assert(days >= 6 * 30, 'min purchase of 6 months');
 
             let data = DomainData {
                 owner: domain_data.owner,
@@ -456,9 +456,8 @@ mod Naming {
             } else {
                 domain_data.expiry + 86400 * days.into()
             };
-            // 25*365 = 9125
-            assert(new_expiry <= now + 86400 * 9125, 'purchase too long');
-            assert(days >= 6 * 30, 'purchase too short');
+            assert(new_expiry <= now + 365 * 25 * 86400, 'max purchase of 25 years');
+            assert(days >= 6 * 30, 'min purchase of 6 months');
 
             let data = DomainData {
                 owner: domain_data.owner,
@@ -707,9 +706,7 @@ mod Naming {
 
         // ADMIN
 
-        fn set_expiry(
-            ref self: ContractState, root_domain: felt252, expiry: u64
-        ) {
+        fn set_expiry(ref self: ContractState, root_domain: felt252, expiry: u64) {
             self.ownable.assert_only_owner();
             let hashed_domain = self.hash_domain(array![root_domain].span());
             let domain_data = self._domain_data.read(hashed_domain);
diff --git a/src/tests/naming/test_abuses.cairo b/src/tests/naming/test_abuses.cairo
index 7b83f22..4f1e130 100644
--- a/src/tests/naming/test_abuses.cairo
+++ b/src/tests/naming/test_abuses.cairo
@@ -164,7 +164,7 @@ fn test_non_owner_cannot_transfer_domain() {
 
 #[test]
 #[available_gas(2000000000)]
-#[should_panic(expected: ('purchase too short', 'ENTRYPOINT_FAILED'))]
+#[should_panic(expected: ('min purchase of 6 months', 'ENTRYPOINT_FAILED'))]
 fn test_renewal_period_too_short() {
     // setup
     let (eth, pricing, identity, naming) = deploy();
@@ -190,7 +190,7 @@ fn test_renewal_period_too_short() {
 
 #[test]
 #[available_gas(2000000000)]
-#[should_panic(expected: ('purchase too long', 'ENTRYPOINT_FAILED'))]
+#[should_panic(expected: ('max purchase of 25 years', 'ENTRYPOINT_FAILED'))]
 fn test_renewal_period_too_long() {
     // setup
     let (eth, pricing, identity, naming) = deploy();
@@ -334,5 +334,13 @@ fn test_buy_empty_domain() {
 
     // we buy with no resolver, no sponsor, no discount and empty metadata
     naming
-        .buy(1, empty_domain, 365, ContractAddressZeroable::zero(), ContractAddressZeroable::zero(), 0, 0);
+        .buy(
+            1,
+            empty_domain,
+            365,
+            ContractAddressZeroable::zero(),
+            ContractAddressZeroable::zero(),
+            0,
+            0
+        );
 }