diff --git a/test/collection_test.rb b/test/collection_test.rb
index 8088d28..d07ded0 100644
--- a/test/collection_test.rb
+++ b/test/collection_test.rb
@@ -466,31 +466,34 @@ class TestCollection < Test::Unit::TestCase
       assert res["timeMillis"]
     end
 
-    def test_map_reduce_with_collection_merge
-      @@test << {:user_id => 1}
-      @@test << {:user_id => 2}
-      output_collection = "test-map-coll"
-      m = Code.new("function() { emit(this.user_id, {count: 1}); }")
-      r = Code.new("function(k,vals) { var sum = 0;" +
-        " vals.forEach(function(v) { sum += v.count;} ); return {count: sum}; }")
-      res = @@test.map_reduce(m, r, :out => output_collection)
 
-      @@test.remove
-      @@test << {:user_id => 3}
-      res = @@test.map_reduce(m, r, :out => {:merge => output_collection})
-      assert res.find.to_a.any? {|doc| doc["_id"] == 3 && doc["value"]["count"] == 1}
+    if @@version >= "1.8.0"
+      def test_map_reduce_with_collection_merge
+        @@test << {:user_id => 1}
+        @@test << {:user_id => 2}
+        output_collection = "test-map-coll"
+        m = Code.new("function() { emit(this.user_id, {count: 1}); }")
+        r = Code.new("function(k,vals) { var sum = 0;" +
+          " vals.forEach(function(v) { sum += v.count;} ); return {count: sum}; }")
+        res = @@test.map_reduce(m, r, :out => output_collection)
 
-      @@test.remove
-      @@test << {:user_id => 3}
-      res = @@test.map_reduce(m, r, :out => {:reduce => output_collection})
-      assert res.find.to_a.any? {|doc| doc["_id"] == 3 && doc["value"]["count"] == 2}
+        @@test.remove
+        @@test << {:user_id => 3}
+        res = @@test.map_reduce(m, r, :out => {:merge => output_collection})
+        assert res.find.to_a.any? {|doc| doc["_id"] == 3 && doc["value"]["count"] == 1}
 
-      assert_raise ArgumentError do
-        @@test.map_reduce(m, r, :out => {:inline => 1})
+        @@test.remove
+        @@test << {:user_id => 3}
+        res = @@test.map_reduce(m, r, :out => {:reduce => output_collection})
+        assert res.find.to_a.any? {|doc| doc["_id"] == 3 && doc["value"]["count"] == 2}
+
+        assert_raise ArgumentError do
+          @@test.map_reduce(m, r, :out => {:inline => 1})
+        end
+
+        @@test.map_reduce(m, r, :raw => true, :out => {:inline => 1})
+        assert res["results"]
       end
-
-      @@test.map_reduce(m, r, :raw => true, :out => {:inline => 1})
-      assert res["results"]
     end
   end