diff --git a/python/src/com/jetbrains/python/psi/types/PyClassType.java b/python/src/com/jetbrains/python/psi/types/PyClassType.java
index 00609ae38dca..77e270dc2b8b 100644
--- a/python/src/com/jetbrains/python/psi/types/PyClassType.java
+++ b/python/src/com/jetbrains/python/psi/types/PyClassType.java
@@ -175,6 +175,15 @@ public class PyClassType extends UserDataHolderBase implements PyType {
         }
       }
     }
+    if (isDefinition() && myClass.isNewStyleClass()) {
+      PyClassType typeType = PyBuiltinCache.getInstance(myClass).getObjectType("type");
+      if (typeType != null) {
+        List<? extends RatedResolveResult> typeMembers = typeType.resolveMember(name, location, direction, resolveContext);
+        if (typeMembers != null && !typeMembers.isEmpty()) {
+          return typeMembers;
+        }
+      }
+    }
     return Collections.emptyList();
   }
 
@@ -238,6 +247,13 @@ public class PyClassType extends UserDataHolderBase implements PyType {
 
     addInheritedMembers(prefix, location, context, ret);
 
+    if (isDefinition() && myClass.isNewStyleClass()) {
+      PyClassType typeType = PyBuiltinCache.getInstance(myClass).getObjectType("type");
+      if (typeType != null) {
+        Collections.addAll(ret, typeType.getCompletionVariants(prefix, location, context));
+      }
+    }
+
     return ret.toArray();
   }
 
diff --git a/python/testData/completion/mro.after.py b/python/testData/completion/mro.after.py
new file mode 100644
index 000000000000..f11910d9e13a
--- /dev/null
+++ b/python/testData/completion/mro.after.py
@@ -0,0 +1,5 @@
+class C(object):
+    pass
+
+
+C.__mro__
\ No newline at end of file
diff --git a/python/testData/completion/mro.py b/python/testData/completion/mro.py
new file mode 100644
index 000000000000..cee5359fcabe
--- /dev/null
+++ b/python/testData/completion/mro.py
@@ -0,0 +1,5 @@
+class C(object):
+    pass
+
+
+C.__m<caret>
\ No newline at end of file
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection/mro.py b/python/testData/inspections/PyUnresolvedReferencesInspection/mro.py
new file mode 100644
index 000000000000..ea1d5b821705
--- /dev/null
+++ b/python/testData/inspections/PyUnresolvedReferencesInspection/mro.py
@@ -0,0 +1,3 @@
+class C(object): pass
+
+C.__mro__
diff --git a/python/testSrc/com/jetbrains/python/PythonCompletionTest.java b/python/testSrc/com/jetbrains/python/PythonCompletionTest.java
index 77fb149bddd4..cb38bda54490 100644
--- a/python/testSrc/com/jetbrains/python/PythonCompletionTest.java
+++ b/python/testSrc/com/jetbrains/python/PythonCompletionTest.java
@@ -392,4 +392,8 @@ public class PythonCompletionTest extends PyLightFixtureTestCase {
   public void testDuplicateColon() {  // PY-2652
     doTest();
   }
+
+  public void testMro() {  // PY-3989
+    doTest();
+  }
 }
diff --git a/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java b/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java
index 185631923cf1..49f972c3ab2e 100644
--- a/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java
+++ b/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java
@@ -36,6 +36,10 @@ public class PyUnresolvedReferencesInspectionTest extends PyLightFixtureTestCase
     doTest();
   }
 
+  public void testMro() {  // PY-3989
+    doTest();
+  }
+
   public void testConditionalImports() { // PY-983
     myFixture.configureByFiles(TEST_DIRECTORY + getTestName(true) + ".py",
                                TEST_DIRECTORY + "lib1.py",