diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
index ee8ffe78cae..b23c9258857 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
@@ -30,7 +30,7 @@ import org.jetbrains.jet.codegen.bridges.BridgesPackage;
 import org.jetbrains.jet.codegen.context.ClassContext;
 import org.jetbrains.jet.codegen.context.ConstructorContext;
 import org.jetbrains.jet.codegen.context.MethodContext;
-import org.jetbrains.jet.codegen.signature.*;
+import org.jetbrains.jet.codegen.signature.BothSignatureWriter;
 import org.jetbrains.jet.codegen.state.GenerationState;
 import org.jetbrains.jet.codegen.state.JetTypeMapper;
 import org.jetbrains.jet.descriptors.serialization.BitEncoding;
@@ -1034,7 +1034,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         for (PropertyAndDefaultValue info : classObjectPropertiesToCopy) {
             PropertyDescriptor property = info.descriptor;
 
-            FieldVisitor fv = v.newField(null, ACC_STATIC | ACC_FINAL | ACC_PUBLIC, context.getFieldName(property),
+            FieldVisitor fv = v.newField(null, ACC_STATIC | ACC_FINAL | ACC_PUBLIC, context.getFieldName(property, false),
                                               typeMapper.mapType(property).getDescriptor(), null, info.defaultValue);
 
             AnnotationCodegen.forField(fv, typeMapper).genAnnotations(property);
@@ -1177,7 +1177,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
                 iv.load(codegen.myFrameMap.getIndex(descriptor), type);
                 PropertyDescriptor propertyDescriptor = bindingContext.get(BindingContext.PRIMARY_CONSTRUCTOR_PARAMETER, parameter);
                 assert propertyDescriptor != null : "Property descriptor is not found for primary constructor parameter: " + parameter;
-                iv.putfield(classAsmType.getInternalName(), context.getFieldName(propertyDescriptor), type.getDescriptor());
+                iv.putfield(classAsmType.getInternalName(), context.getFieldName(propertyDescriptor, false), type.getDescriptor());
             }
             curParam++;
         }
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/context/FieldOwnerContext.java b/compiler/backend/src/org/jetbrains/jet/codegen/context/FieldOwnerContext.java
index ece881dda9e..c4d91177101 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/context/FieldOwnerContext.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/context/FieldOwnerContext.java
@@ -20,16 +20,17 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.codegen.OwnerKind;
 import org.jetbrains.jet.codegen.binding.MutableClosure;
-import org.jetbrains.jet.lang.descriptors.*;
+import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
+import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
+import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
 import org.jetbrains.jet.lang.resolve.java.JvmAbi;
 
 import java.util.HashMap;
 import java.util.Map;
 
 public abstract class FieldOwnerContext<T extends DeclarationDescriptor> extends CodegenContext<T> {
-
     //default property name -> map<property descriptor -> bytecode name>
-    private Map<String, Map<PropertyDescriptor, String>> fieldNames = new HashMap<String, Map<PropertyDescriptor, String>>();
+    private final Map<String, Map<PropertyDescriptor, String>> fieldNames = new HashMap<String, Map<PropertyDescriptor, String>>();
 
     public FieldOwnerContext(
             @NotNull T contextDescriptor,
@@ -42,19 +43,16 @@ public abstract class FieldOwnerContext<T extends DeclarationDescriptor> extends
         super(contextDescriptor, contextKind, parentContext, closure, thisDescriptor, expressionCodegen);
     }
 
-    public String getFieldName(PropertyDescriptor descriptor) {
-        return getFieldName(descriptor, false);
-    }
-
-    public String getFieldName(PropertyDescriptor descriptor, boolean isDelegated) {
-        assert descriptor.getKind() != CallableMemberDescriptor.Kind.FAKE_OVERRIDE;
+    @NotNull
+    public String getFieldName(@NotNull PropertyDescriptor descriptor, boolean isDelegated) {
+        assert descriptor.getKind().isReal() : "Only declared properties can have backing fields: " + descriptor;
         boolean isExtension = descriptor.getReceiverParameter() != null;
 
-        return getFieldName(descriptor, isDelegated, isExtension);
+        return getFieldName(descriptor.getOriginal(), isDelegated, isExtension);
     }
 
-    private String getFieldName(PropertyDescriptor descriptor, boolean isDelegated, boolean isExtension) {
-        descriptor = descriptor.getOriginal();
+    @NotNull
+    private String getFieldName(@NotNull PropertyDescriptor descriptor, boolean isDelegated, boolean isExtension) {
         String defaultPropertyName = JvmAbi.getDefaultPropertyName(descriptor.getName(), isDelegated, isExtension);
 
         Map<PropertyDescriptor, String> descriptor2Name = fieldNames.get(defaultPropertyName);
@@ -64,10 +62,10 @@ public abstract class FieldOwnerContext<T extends DeclarationDescriptor> extends
         }
 
         String actualName = descriptor2Name.get(descriptor);
-        if (actualName == null) {
-            actualName = descriptor2Name.isEmpty() ? defaultPropertyName : defaultPropertyName + "$" + descriptor2Name.size();
-            descriptor2Name.put(descriptor, actualName);
-        }
-        return actualName;
+        if (actualName != null) return actualName;
+
+        String newName = descriptor2Name.isEmpty() ? defaultPropertyName : defaultPropertyName + "$" + descriptor2Name.size();
+        descriptor2Name.put(descriptor, newName);
+        return newName;
     }
 }