diff --git a/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorDeserializer.java b/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorDeserializer.java
index 59ac544722b..5b53c0600eb 100644
--- a/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorDeserializer.java
+++ b/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorDeserializer.java
@@ -22,10 +22,7 @@ import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.descriptors.Modality;
 import org.jetbrains.jet.lang.descriptors.Visibility;
 import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
-import org.jetbrains.jet.lang.descriptors.impl.PropertyDescriptorImpl;
-import org.jetbrains.jet.lang.descriptors.impl.SimpleFunctionDescriptorImpl;
-import org.jetbrains.jet.lang.descriptors.impl.TypeParameterDescriptorImpl;
-import org.jetbrains.jet.lang.descriptors.impl.ValueParameterDescriptorImpl;
+import org.jetbrains.jet.lang.descriptors.impl.*;
 import org.jetbrains.jet.lang.types.Variance;
 
 import java.util.ArrayList;
@@ -91,7 +88,7 @@ public class DescriptorDeserializer {
             case VAR:
                 return loadProperty(proto);
             case CONSTRUCTOR:
-                break;
+                return loadConstructor(proto);
         }
         throw new IllegalArgumentException("Unsupported callable kind: " + callableKind);
     }
@@ -148,6 +145,25 @@ public class DescriptorDeserializer {
         return function;
     }
 
+    @NotNull
+    private CallableMemberDescriptor loadConstructor(@NotNull Callable proto) {
+        ClassDescriptor classDescriptor = (ClassDescriptor) containingDeclaration;
+        ConstructorDescriptorImpl descriptor = new ConstructorDescriptorImpl(
+                classDescriptor,
+                // TODO
+                Collections.<AnnotationDescriptor>emptyList(),
+                // TODO: primary
+                true);
+        DescriptorDeserializer local = new DescriptorDeserializer(this, descriptor, nameResolver);
+        descriptor.initialize(
+                classDescriptor.getTypeConstructor().getParameters(),
+                local.valueParameters(proto.getValueParametersList()),
+                visibility(Flags.getVisibility(proto.getFlags())),
+                !classDescriptor.isInner()
+        );
+        return descriptor;
+    }
+
     private static CallableMemberDescriptor.Kind memberKind(Callable.MemberKind memberKind) {
         switch (memberKind) {
             case DECLARATION:
diff --git a/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorSerializer.java b/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorSerializer.java
index 8648a569d94..1eacbb09d1e 100644
--- a/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorSerializer.java
+++ b/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorSerializer.java
@@ -73,7 +73,13 @@ public class DescriptorSerializer {
         }
 
         // TODO: nested classes
-        // TODO: constructor
+
+        ConstructorDescriptor primaryConstructor = classDescriptor.getUnsubstitutedPrimaryConstructor();
+        if (primaryConstructor != null) {
+            builder.setPrimaryConstructor(local.callableProto(primaryConstructor));
+        }
+        // TODO: other constructors
+
         // TODO: class object
 
         for (DeclarationDescriptor descriptor : classDescriptor.getDefaultType().getMemberScope().getAllDescriptors()) {
diff --git a/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/descriptors/DeserializedClassDescriptor.java b/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/descriptors/DeserializedClassDescriptor.java
index 72375fa6827..84d7d8f87c3 100644
--- a/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/descriptors/DeserializedClassDescriptor.java
+++ b/compiler/frontend/serialization/src/org/jetbrains/jet/descriptors/serialization/descriptors/DeserializedClassDescriptor.java
@@ -25,6 +25,8 @@ import org.jetbrains.jet.lang.descriptors.impl.ClassDescriptorBase;
 import org.jetbrains.jet.lang.descriptors.impl.ReceiverParameterDescriptorImpl;
 import org.jetbrains.jet.lang.resolve.OverrideResolver;
 import org.jetbrains.jet.lang.resolve.TraceUtil;
+import org.jetbrains.jet.lang.resolve.lazy.storage.NullableLazyValue;
+import org.jetbrains.jet.lang.resolve.lazy.storage.NullableLazyValueImpl;
 import org.jetbrains.jet.lang.resolve.name.Name;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
 import org.jetbrains.jet.lang.resolve.scopes.receivers.ClassReceiver;
@@ -41,6 +43,8 @@ public class DeserializedClassDescriptor extends ClassDescriptorBase implements
     private final DeserializedMemberScope memberScope;
     private final ReceiverParameterDescriptor thisAsReceiverParameter;
 
+    private final NullableLazyValue<ConstructorDescriptor> primaryConstructor;
+
     private final Name name;
     private final DeclarationDescriptor containingDeclaration;
     private final DeserializedClassTypeConstructor typeConstructor;
@@ -71,6 +75,13 @@ public class DeserializedClassDescriptor extends ClassDescriptorBase implements
         this.visibility = DescriptorDeserializer.visibility(Flags.getVisibility(flags));
         this.kind = DescriptorDeserializer.classKind(Flags.getClassKind(flags));
         this.isInner = Flags.isInner(flags);
+
+        this.primaryConstructor = new NullableLazyValueImpl<ConstructorDescriptor>() {
+            @Override
+            protected ConstructorDescriptor doCompute() {
+                return computePrimaryConstructor();
+            }
+        };
     }
 
     @NotNull
@@ -137,16 +148,29 @@ public class DeserializedClassDescriptor extends ClassDescriptorBase implements
         return JetScope.EMPTY; // TODO inner classes
     }
 
+    @Nullable
+    private ConstructorDescriptor computePrimaryConstructor() {
+        if (!classProto.hasPrimaryConstructor()) return null;
+
+        ProtoBuf.Callable constructorProto = classProto.getPrimaryConstructor();
+        return (ConstructorDescriptor) deserializer.loadCallable(constructorProto);
+    }
+
     @Nullable
     @Override
     public ConstructorDescriptor getUnsubstitutedPrimaryConstructor() {
-        return null; // TODO
+        return primaryConstructor.compute();
     }
 
     @NotNull
     @Override
     public Collection<ConstructorDescriptor> getConstructors() {
-        return Collections.emptyList(); // TODO
+        ConstructorDescriptor constructor = getUnsubstitutedPrimaryConstructor();
+        if (constructor == null) {
+            return Collections.emptyList();
+        }
+        // TODO: other constructors
+        return Collections.singletonList(constructor);
     }
 
     @Nullable