diff --git a/spring-cloud-gateway-server-webflux/src/main/resources/META-INF/scripts/request_rate_limiter.lua b/spring-cloud-gateway-server-webflux/src/main/resources/META-INF/scripts/request_rate_limiter.lua
index 37033036b3..aafdcb671d 100644
--- a/spring-cloud-gateway-server-webflux/src/main/resources/META-INF/scripts/request_rate_limiter.lua
+++ b/spring-cloud-gateway-server-webflux/src/main/resources/META-INF/scripts/request_rate_limiter.lua
@@ -5,7 +5,13 @@ local timestamp_key = KEYS[2]
 
 local rate = tonumber(ARGV[1])
 local capacity = tonumber(ARGV[2])
-local now = tonumber(ARGV[3]) or redis.call('TIME')[1]
+
+local now = tonumber(ARGV[3])
+if not now then
+  local redis_time = redis.call('TIME')
+  now = redis_time[1] + (redis_time[2] / 1000000)
+end
+
 local requested = tonumber(ARGV[4])
 
 local fill_time = capacity / rate
diff --git a/spring-cloud-gateway-server-webflux/src/test/java/org/springframework/cloud/gateway/filter/ratelimit/RedisRateLimiterLuaScriptTests.java b/spring-cloud-gateway-server-webflux/src/test/java/org/springframework/cloud/gateway/filter/ratelimit/RedisRateLimiterLuaScriptTests.java
index dd04862f61..fcf17a45d3 100644
--- a/spring-cloud-gateway-server-webflux/src/test/java/org/springframework/cloud/gateway/filter/ratelimit/RedisRateLimiterLuaScriptTests.java
+++ b/spring-cloud-gateway-server-webflux/src/test/java/org/springframework/cloud/gateway/filter/ratelimit/RedisRateLimiterLuaScriptTests.java
@@ -75,6 +75,10 @@ static List<String> getArgs(long rate, long capacity, long now, long requested)
 		return Arrays.asList(rate + "", capacity + "", now + "", requested + "");
 	}
 
+	static List<String> getArgsWithRedisTime(long rate, long capacity, long requested) {
+		return Arrays.asList(rate + "", capacity + "", "", requested + "");
+	}
+
 	@Test
 	public void testNewAccess() {
 		long rate = 1;
@@ -164,6 +168,24 @@ public void testCapacityExceedsMaxInt() {
 		assertThat(result.get(1)).isEqualTo(REDIS_LUA_MAX_SAFE_INTEGER - 1);
 	}
 
+	@Test
+	public void testRedisTimeSupportsSubSecondRefill() throws InterruptedException {
+		long rate = 10;
+		long capacity = 10;
+		List<String> keys = getKeys("sub_second_refill");
+
+		List<String> args = getArgsWithRedisTime(rate, capacity, capacity);
+		List<Long> first = redisTemplate.execute(redisScript, keys, args).blockFirst();
+		assertThat(first.get(0)).isEqualTo(1);
+		assertThat(first.get(1)).isEqualTo(0);
+
+		Thread.sleep(250);
+
+		args = getArgsWithRedisTime(rate, capacity, 1);
+		List<Long> second = redisTemplate.execute(redisScript, keys, args).blockFirst();
+		assertThat(second.get(0)).isEqualTo(1);
+	}
+
 	@EnableAutoConfiguration
 	@SpringBootConfiguration
 	public static class TestConfig {