diff --git a/j2k/src/org/jetbrains/jet/j2k/Converter.java b/j2k/src/org/jetbrains/jet/j2k/Converter.java
index 98ae433ccef..881488bf855 100644
--- a/j2k/src/org/jetbrains/jet/j2k/Converter.java
+++ b/j2k/src/org/jetbrains/jet/j2k/Converter.java
@@ -751,7 +751,7 @@ public class Converter {
             boolean containsQuestDot = expressionToExpression(expression).toKotlin().contains("?.");
 
             if (isPrimitiveTypeOrNull && isRef && containsQuestDot) {
-                conversion += ".sure()";
+                conversion += "!!";
             }
 
             if (actualType != null) {
diff --git a/j2k/tests/testData/ast/issues/file/kt-809.kt b/j2k/tests/testData/ast/issues/file/kt-809.kt
index 78932463e03..d31d733c260 100644
--- a/j2k/tests/testData/ast/issues/file/kt-809.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-809.kt
@@ -13,7 +13,7 @@ open class Test() {
 open fun putInt(i : Int) : Unit {
 }
 open fun test() : Unit {
-putInt((One.myContainer?.myInt).sure())
-IntContainer((One.myContainer?.myInt).sure())
+putInt((One.myContainer?.myInt)!!)
+IntContainer((One.myContainer?.myInt)!!)
 }
 }
\ No newline at end of file
diff --git a/j2k/tests/testData/ast/issues/file/kt-820-field.kt b/j2k/tests/testData/ast/issues/file/kt-820-field.kt
index 9ea09ce6370..5f9141abcc7 100644
--- a/j2k/tests/testData/ast/issues/file/kt-820-field.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-820-field.kt
@@ -8,5 +8,5 @@ var myContainer : Container? = Container()
 }
 }
 open class Test() {
-var b : Byte = One.myContainer?.myInt.sure().toByte()
+var b : Byte = One.myContainer?.myInt!!.toByte()
 }
\ No newline at end of file
diff --git a/j2k/tests/testData/ast/issues/file/kt-820-string.kt b/j2k/tests/testData/ast/issues/file/kt-820-string.kt
index 4e57eeda5ec..762e1aa8f90 100644
--- a/j2k/tests/testData/ast/issues/file/kt-820-string.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-820-string.kt
@@ -1,7 +1,7 @@
 open class Test() {
 class object {
 public open fun toFileSystemSafeName(name : String?) : String? {
-var size : Int = name?.length().sure()
+var size : Int = name?.length()!!
 return name
 }
 }
diff --git a/j2k/tests/testData/ast/issues/file/kt-820.kt b/j2k/tests/testData/ast/issues/file/kt-820.kt
index b9940817b8b..77fbee788f3 100644
--- a/j2k/tests/testData/ast/issues/file/kt-820.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-820.kt
@@ -9,6 +9,6 @@ var myContainer : Container? = Container()
 }
 open class Test() {
 open fun test() : Unit {
-var b : Byte = One.myContainer?.myInt.sure().toByte()
+var b : Byte = One.myContainer?.myInt!!.toByte()
 }
 }
\ No newline at end of file
diff --git a/j2k/tests/testData/ast/issues/file/kt-824-isDir.kt b/j2k/tests/testData/ast/issues/file/kt-824-isDir.kt
index 3ed40c7ecc3..488b6b79db6 100644
--- a/j2k/tests/testData/ast/issues/file/kt-824-isDir.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-824-isDir.kt
@@ -8,7 +8,7 @@ if (parent == null || !parent?.exists())
 return false
 }
 var result : Boolean = true
-if (parent?.isDirectory().sure())
+if (parent?.isDirectory()!!)
 {
 return true
 }
diff --git a/j2k/tests/testData/ast/issues/file/kt-824.kt b/j2k/tests/testData/ast/issues/file/kt-824.kt
index 5059669b42a..065f372cb69 100644
--- a/j2k/tests/testData/ast/issues/file/kt-824.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-824.kt
@@ -9,18 +9,18 @@ var myContainer : Container? = Container()
 }
 open class Test() {
 open fun test() : Unit {
-if (One.myContainer?.myBoolean.sure())
+if (One.myContainer?.myBoolean!!)
 System.out?.println("Ok")
-var s : String? = (if (One.myContainer?.myBoolean.sure())
+var s : String? = (if (One.myContainer?.myBoolean!!)
 "YES"
 else
 "NO")
-while (One.myContainer?.myBoolean.sure())
+while (One.myContainer?.myBoolean!!)
 System.out?.println("Ok")
 do
 {
 System.out?.println("Ok")
 }
-while (One.myContainer?.myBoolean.sure())
+while (One.myContainer?.myBoolean!!)
 }
 }
\ No newline at end of file
diff --git a/j2k/tests/testData/ast/issues/file/kt-837.kt b/j2k/tests/testData/ast/issues/file/kt-837.kt
index 07834c5c81e..a04124924ea 100644
--- a/j2k/tests/testData/ast/issues/file/kt-837.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-837.kt
@@ -3,7 +3,7 @@ import java.io.Serializable
 public open class Language(code : String?) : Serializable {
 protected var code : String? = null
 public open fun equals(other : Language?) : Boolean {
-return other?.toString()?.equals(this.toString()).sure()
+return other?.toString()?.equals(this.toString())!!
 }
 {
 this.code = code
diff --git a/j2k/tests/testData/ast/issues/file/kt-852.kt b/j2k/tests/testData/ast/issues/file/kt-852.kt
index 4e642d623ac..e6a3cb181f0 100644
--- a/j2k/tests/testData/ast/issues/file/kt-852.kt
+++ b/j2k/tests/testData/ast/issues/file/kt-852.kt
@@ -4,9 +4,9 @@ open fun test() : String? {
 var s1 : String? = ""
 var s2 : String? = ""
 var s3 : String? = ""
-if ((s1?.isEmpty()).sure() && (s2?.isEmpty()).sure())
+if ((s1?.isEmpty())!! && (s2?.isEmpty())!!)
 return "OK"
-if ((s1?.isEmpty()).sure() && (s2?.isEmpty()).sure() && (s3?.isEmpty()).sure())
+if ((s1?.isEmpty())!! && (s2?.isEmpty())!! && (s3?.isEmpty())!!)
 return "OOOK"
 return ""
 }