diff --git a/redisson/src/main/java/org/redisson/RedissonPermitExpirableSemaphore.java b/redisson/src/main/java/org/redisson/RedissonPermitExpirableSemaphore.java
index b84d7b63c..836080f1e 100644
--- a/redisson/src/main/java/org/redisson/RedissonPermitExpirableSemaphore.java
+++ b/redisson/src/main/java/org/redisson/RedissonPermitExpirableSemaphore.java
@@ -719,9 +719,6 @@ public class RedissonPermitExpirableSemaphore extends RedissonExpirable implemen
                     "return 0;" +
                 "end;" +
                 "local delta = tonumber(ARGV[1]) - maximum; " +
-                "if (delta == 0) then " +
-                    "return 0;" +
-                "end;" +
                 "redis.call('incrby', KEYS[1], delta); " +
                 "redis.call('publish', KEYS[2], ARGV[1]); " +
                 "return delta;",
diff --git a/redisson/src/test/java/org/redisson/RedissonPermitExpirableSemaphoreTest.java b/redisson/src/test/java/org/redisson/RedissonPermitExpirableSemaphoreTest.java
index 46e505fd3..18a59a989 100644
--- a/redisson/src/test/java/org/redisson/RedissonPermitExpirableSemaphoreTest.java
+++ b/redisson/src/test/java/org/redisson/RedissonPermitExpirableSemaphoreTest.java
@@ -247,6 +247,8 @@ public class RedissonPermitExpirableSemaphoreTest extends BaseConcurrentTest {
         assertThat(s.availablePermits()).isEqualTo(15);
         s.addPermits(-10);
         assertThat(s.availablePermits()).isEqualTo(5);
+        s.addPermits(-10);
+        assertThat(s.availablePermits()).isEqualTo(-5);
     }
     
     @Test