diff --git a/plugins/limit_count_redis/filter.go b/plugins/limit_count_redis/filter.go
index 6dd563b8..b019dced 100644
--- a/plugins/limit_count_redis/filter.go
+++ b/plugins/limit_count_redis/filter.go
@@ -149,13 +149,12 @@ func (f *filter) EncodeHeaders(headers api.ResponseHeaderMap, endStream bool) ap
 	}
 
 	// According to the RFC, these headers MUST NOT occur multiple times.
-	headers.Add("x-ratelimit-limit", fmt.Sprintf("%d, %s", minCount, config.quotaPolicy))
+	headers.Set("x-ratelimit-limit", fmt.Sprintf("%d, %s", minCount, config.quotaPolicy))
 	if minRemain <= 0 {
-		headers.Add("x-ratelimit-remaining", "0")
+		headers.Set("x-ratelimit-remaining", "0")
 	} else {
-		headers.Add("x-ratelimit-remaining", strconv.FormatInt(minRemain, 10))
+		headers.Set("x-ratelimit-remaining", strconv.FormatInt(minRemain, 10))
 	}
-	headers.Add("x-ratelimit-remaining", strconv.FormatInt(minRemain, 10))
-	headers.Add("x-ratelimit-reset", strconv.FormatInt(minTTL, 10))
+	headers.Set("x-ratelimit-reset", strconv.FormatInt(minTTL, 10))
 	return api.Continue
 }
diff --git a/plugins/tests/integration/limit_count_redis_test.go b/plugins/tests/integration/limit_count_redis_test.go
index 54487b4b..7319f2a9 100644
--- a/plugins/tests/integration/limit_count_redis_test.go
+++ b/plugins/tests/integration/limit_count_redis_test.go
@@ -127,9 +127,9 @@ func TestLimitCountRedis(t *testing.T) {
 				hdr.Add("x-key", "1")
 				resp, _ := dp.Head("/echo", hdr)
 				assert.Equal(t, 200, resp.StatusCode)
-				assert.Equal(t, "1, 1;w=1", resp.Header.Get("X-Ratelimit-Limit"))
-				assert.Equal(t, "0", resp.Header.Get("X-Ratelimit-Remaining"))
-				assert.Equal(t, "1", resp.Header.Get("X-Ratelimit-Reset"))
+				assert.Equal(t, []string{"1, 1;w=1"}, resp.Header.Values("X-Ratelimit-Limit"))
+				assert.Equal(t, []string{"0"}, resp.Header.Values("X-Ratelimit-Remaining"))
+				assert.Equal(t, []string{"1"}, resp.Header.Values("X-Ratelimit-Reset"))
 				resp, _ = dp.Head("/echo", hdr)
 				assert.Equal(t, 429, resp.StatusCode)
 				assert.Equal(t, "1, 1;w=1", resp.Header.Get("X-Ratelimit-Limit"))
@@ -163,9 +163,9 @@ func TestLimitCountRedis(t *testing.T) {
 				hdr.Add("x-key", "1")
 				resp, _ := dp.Head("/echo", hdr)
 				assert.Equal(t, 200, resp.StatusCode)
-				assert.Equal(t, "2, 2;w=10, 2;w=1, 3;w=1", resp.Header.Get("X-Ratelimit-Limit"))
-				assert.Equal(t, "1", resp.Header.Get("X-Ratelimit-Remaining"))
-				assert.Equal(t, "10", resp.Header.Get("X-Ratelimit-Reset"))
+				assert.Equal(t, []string{"2, 2;w=10, 2;w=1, 3;w=1"}, resp.Header.Values("X-Ratelimit-Limit"))
+				assert.Equal(t, []string{"1"}, resp.Header.Values("X-Ratelimit-Remaining"))
+				assert.Equal(t, []string{"10"}, resp.Header.Values("X-Ratelimit-Reset"))
 
 				hdr2 := http.Header{}
 				hdr2.Add("x-key", "2")