diff --git a/README.md b/README.md
index 619d76c..091de80 100644
--- a/README.md
+++ b/README.md
@@ -2038,7 +2038,7 @@ Turn on misspellings after a certain number of characters
 Product.search("api", misspellings: {prefix_length: 2}) # api, apt, no ahi
 ```
 
-**Note:** With this option, if the query length is the same as `prefix_length`, misspellings are turned off with Elasticsearch 7 and OpenSearch
+**Note:** With this option, if the query length is the same as `prefix_length`, misspellings are turned off with Elasticsearch 7 and OpenSearch 1
 
 ```ruby
 Product.search("ah", misspellings: {prefix_length: 2}) # ah, no aha
diff --git a/lib/searchkick.rb b/lib/searchkick.rb
index 5924a3c..0d288ce 100644
--- a/lib/searchkick.rb
+++ b/lib/searchkick.rb
@@ -135,8 +135,9 @@ module Searchkick
     @opensearch
   end
 
-  def self.server_below?(version)
-    server_version = opensearch? ? "7.10.2" : self.server_version
+  # TODO always check true version in Searchkick 6
+  def self.server_below?(version, true_version = false)
+    server_version = !true_version && opensearch? ? "7.10.2" : self.server_version
     Gem::Version.new(server_version.split("-")[0]) < Gem::Version.new(version.split("-")[0])
   end
 
diff --git a/test/misspellings_test.rb b/test/misspellings_test.rb
index f41d263..9cdaf4f 100644
--- a/test/misspellings_test.rb
+++ b/test/misspellings_test.rb
@@ -13,7 +13,7 @@ class MisspellingsTest < Minitest::Test
 
   def test_prefix_length
     store_names ["ap", "api", "apt", "any", "nap", "ah", "ahi"]
-    if Searchkick.server_below?("8.0.0")
+    if prefix_length_misspellings_off?
       assert_search "ap", ["ap"], misspellings: {prefix_length: 2}
     else
       assert_search "ap", ["ap", "api", "apt"], misspellings: {prefix_length: 2}
@@ -23,7 +23,7 @@ class MisspellingsTest < Minitest::Test
 
   def test_prefix_length_operator
     store_names ["ap", "api", "apt", "any", "nap", "ah", "aha"]
-    if Searchkick.server_below?("8.0.0")
+    if prefix_length_misspellings_off?
       assert_search "ap ah", ["ap", "ah"], operator: "or", misspellings: {prefix_length: 2}
     else
       assert_search "ap ah", ["ap", "ah", "api", "apt", "aha"], operator: "or", misspellings: {prefix_length: 2}
@@ -110,4 +110,10 @@ class MisspellingsTest < Minitest::Test
     store_names ["Sriracha"]
     assert_search "siracha", ["Sriracha"], fields: [{name: :word_middle}], misspellings: {fields: [:name]}
   end
+
+  private
+
+  def prefix_length_misspellings_off?
+    Searchkick.opensearch? ? Searchkick.server_below?("2.0.0", true) : Searchkick.server_below?("8.0.0")
+  end
 end
--
libgit2 0.21.0