diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
index f5d2deed38c..050ae292c91 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ImplementationBodyCodegen.java
@@ -497,7 +497,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
         boolean first = true;
         for (PropertyDescriptor propertyDescriptor : properties) {
             if (first) {
-                iv.aconst(descriptor.getName() + "{" + propertyDescriptor.getName().getName()+"=");
+                iv.aconst(descriptor.getName() + "(" + propertyDescriptor.getName().getName()+"=");
                 first = false;
             }
             else {
@@ -523,7 +523,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
             invokeAppendMethod(iv, type);
         }
 
-        iv.aconst("}");
+        iv.aconst(")");
         invokeAppendMethod(iv, JAVA_STRING_TYPE);
 
         iv.invokevirtual("java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
diff --git a/compiler/testData/codegen/dataClasses/tostring/arrayParams.kt b/compiler/testData/codegen/dataClasses/tostring/arrayParams.kt
index 4ddedc80981..8f68bfee5a9 100644
--- a/compiler/testData/codegen/dataClasses/tostring/arrayParams.kt
+++ b/compiler/testData/codegen/dataClasses/tostring/arrayParams.kt
@@ -2,13 +2,13 @@ data class A(val x: Array<Int>?, val y: IntArray?)
 
 fun box(): String {
     var ts = A(Array<Int>(2, {it}), IntArray(3)).toString()
-    if(ts != "A{x=[0, 1], y=[0, 0, 0]}") return ts
+    if(ts != "A(x=[0, 1], y=[0, 0, 0])") return ts
 
     ts = A(null, IntArray(3)).toString()
-    if(ts != "A{x=null, y=[0, 0, 0]}") return ts
+    if(ts != "A(x=null, y=[0, 0, 0])") return ts
 
     ts = A(null, null).toString()
-    if(ts != "A{x=null, y=null}") return ts
+    if(ts != "A(x=null, y=null)") return ts
 
     return "OK"
 }
diff --git a/compiler/testData/codegen/dataClasses/tostring/changingVarParam.kt b/compiler/testData/codegen/dataClasses/tostring/changingVarParam.kt
index f25581fb18a..0268af29435 100644
--- a/compiler/testData/codegen/dataClasses/tostring/changingVarParam.kt
+++ b/compiler/testData/codegen/dataClasses/tostring/changingVarParam.kt
@@ -2,10 +2,10 @@ data class A(var string: String)
 
 fun box(): String {
     val a = A("Fail")
-    if(a.toString() != "A{string=Fail}") return "fail"
+    if(a.toString() != "A(string=Fail)") return "fail"
 
     a.string = "OK"
-    if("$a" != "A{string=OK}") return a.toString()
+    if("$a" != "A(string=OK)") return a.toString()
 
     return "OK"
 }
diff --git a/compiler/testData/codegen/dataClasses/tostring/genericParam.kt b/compiler/testData/codegen/dataClasses/tostring/genericParam.kt
index d751f3c6794..794bad5dbe1 100644
--- a/compiler/testData/codegen/dataClasses/tostring/genericParam.kt
+++ b/compiler/testData/codegen/dataClasses/tostring/genericParam.kt
@@ -2,10 +2,10 @@ data class A<T>(val x: T)
 
 fun box(): String {
     val a = A(42)
-    if ("$a" != "A{x=42}") return "$a"
+    if ("$a" != "A(x=42)") return "$a"
     
     val b = A(239.toLong())
-    if ("$b" != "A{x=239}") return "$b"
+    if ("$b" != "A(x=239)") return "$b"
     
     return "OK"
 }
diff --git a/compiler/testData/codegen/dataClasses/tostring/mixedParams.kt b/compiler/testData/codegen/dataClasses/tostring/mixedParams.kt
index 1d0cfdb46dd..2fb2ab314d1 100644
--- a/compiler/testData/codegen/dataClasses/tostring/mixedParams.kt
+++ b/compiler/testData/codegen/dataClasses/tostring/mixedParams.kt
@@ -2,6 +2,6 @@ data class A(var x: Int, y: Int, val z: Int?)
 
 fun box(): String {
     val a = A(1, 2, null)
-    if("$a" != "A{x=1, z=null}") return "$a"
+    if("$a" != "A(x=1, z=null)") return "$a"
     return "OK"
 }
diff --git a/compiler/testData/codegen/dataClasses/tostring/overriddenProperty.kt b/compiler/testData/codegen/dataClasses/tostring/overriddenProperty.kt
index ab0b1856eec..3a4f021fea1 100644
--- a/compiler/testData/codegen/dataClasses/tostring/overriddenProperty.kt
+++ b/compiler/testData/codegen/dataClasses/tostring/overriddenProperty.kt
@@ -7,5 +7,5 @@ class B : A("Fail") {
 fun foo(a: A) = a
 
 fun box(): String {
-    return if ("${foo(B())}" == "A{x=OK}") "OK" else "fail"
+    return if ("${foo(B())}" == "A(x=OK)") "OK" else "fail"
 }
diff --git a/compiler/testData/codegen/dataClasses/tostring/unitComponent.kt b/compiler/testData/codegen/dataClasses/tostring/unitComponent.kt
index 2b6314ef567..602cb8d897b 100644
--- a/compiler/testData/codegen/dataClasses/tostring/unitComponent.kt
+++ b/compiler/testData/codegen/dataClasses/tostring/unitComponent.kt
@@ -2,5 +2,5 @@ data class A(val x: Unit)
 
 fun box(): String {
     val a = A(Unit.VALUE)
-    return if ("$a" == "A{x=Unit.VALUE}") "OK" else "$a"
+    return if ("$a" == "A(x=Unit.VALUE)") "OK" else "$a"
 }