diff --git a/js/js.translator/src/org/jetbrains/kotlin/js/translate/expression/WhenTranslator.java b/js/js.translator/src/org/jetbrains/kotlin/js/translate/expression/WhenTranslator.java
index 11a4b05dbbf..425f6d72674 100644
--- a/js/js.translator/src/org/jetbrains/kotlin/js/translate/expression/WhenTranslator.java
+++ b/js/js.translator/src/org/jetbrains/kotlin/js/translate/expression/WhenTranslator.java
@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.js.translate.general.Translation;
 import org.jetbrains.kotlin.js.translate.operation.InOperationTranslator;
 import org.jetbrains.kotlin.js.translate.utils.JsAstUtils;
 import org.jetbrains.kotlin.js.translate.utils.TranslationUtils;
+import org.jetbrains.kotlin.lexer.KtTokens;
 import org.jetbrains.kotlin.psi.*;
 import org.jetbrains.kotlin.psi.psiUtil.PsiUtilsKt;
 
@@ -208,8 +209,9 @@ public final class WhenTranslator extends AbstractTranslator {
         Map<KtExpression, JsExpression> subjectAliases = new HashMap<KtExpression, JsExpression>();
         subjectAliases.put(whenExpression.getSubjectExpression(), expressionToMatch);
         TranslationContext callContext = context.innerContextWithAliasesForExpressions(subjectAliases);
-        return new InOperationTranslator(callContext, expressionToMatch, condition.getRangeExpression(), condition.getOperationReference())
-                .translate();
+        boolean negated = condition.getOperationReference().getReferencedNameElementType() == KtTokens.NOT_IN;
+        return new InOperationTranslator(callContext, expressionToMatch, condition.getRangeExpression(), condition.getOperationReference(),
+                                         negated).translate();
     }
 
     @Nullable
diff --git a/js/js.translator/src/org/jetbrains/kotlin/js/translate/operation/InOperationTranslator.java b/js/js.translator/src/org/jetbrains/kotlin/js/translate/operation/InOperationTranslator.java
index 37ff9775cd7..376debf621e 100644
--- a/js/js.translator/src/org/jetbrains/kotlin/js/translate/operation/InOperationTranslator.java
+++ b/js/js.translator/src/org/jetbrains/kotlin/js/translate/operation/InOperationTranslator.java
@@ -43,13 +43,15 @@ public class InOperationTranslator extends AbstractTranslator {
     private final JsExpression left;
     private final KtExpression right;
     private final KtSimpleNameExpression operation;
+    private final boolean negated;
 
     public InOperationTranslator(@NotNull TranslationContext context, @NotNull JsExpression left, @NotNull KtExpression right,
-            @NotNull KtSimpleNameExpression operation) {
+            @NotNull KtSimpleNameExpression operation, boolean negated) {
         super(context);
         this.left = left;
         this.right = right;
         this.operation = operation;
+        this.negated = negated;
     }
 
     @NotNull
@@ -67,7 +69,11 @@ public class InOperationTranslator extends AbstractTranslator {
 
     @NotNull
     private JsExpression translateGeneral(@NotNull ResolvedCall<? extends FunctionDescriptor> call, @NotNull JsExpression rightTranslated) {
-        return CallTranslator.translate(context(), call, rightTranslated);
+        JsExpression result = CallTranslator.translate(context(), call, rightTranslated);
+        if (negated) {
+            result = JsAstUtils.negated(result);
+        }
+        return result;
     }
 
     @Nullable
@@ -94,8 +100,15 @@ public class InOperationTranslator extends AbstractTranslator {
     private JsExpression translateInt(@NotNull KtExpression lowerExpression, @NotNull KtExpression upperExpression) {
         JsExpression lower = Translation.translateAsExpression(lowerExpression, context());
         JsExpression upper = Translation.translateAsExpression(upperExpression, context());
-        JsExpression first = JsAstUtils.greaterThanEq(left, lower);
-        JsExpression second = JsAstUtils.lessThanEq(left, upper);
-        return JsAstUtils.and(first, second);
+        if (!negated) {
+            JsExpression first = JsAstUtils.greaterThanEq(left, lower);
+            JsExpression second = JsAstUtils.lessThanEq(left, upper);
+            return JsAstUtils.and(first, second);
+        }
+        else {
+            JsExpression first = JsAstUtils.lessThan(left, lower);
+            JsExpression second = JsAstUtils.greaterThan(left, upper);
+            return JsAstUtils.or(first, second);
+        }
     }
 }
diff --git a/js/js.translator/testData/expression/when/cases/whenWithCustomRangeClause.kt b/js/js.translator/testData/expression/when/cases/whenWithCustomRangeClause.kt
index ff8ce1a2b07..54bae10c83b 100644
--- a/js/js.translator/testData/expression/when/cases/whenWithCustomRangeClause.kt
+++ b/js/js.translator/testData/expression/when/cases/whenWithCustomRangeClause.kt
@@ -4,7 +4,10 @@ package foo
 
 fun box(): String {
     var result = testFun(-1) + testFun(0) + testFun(5) + testFun(9) + testFun(10) + testFun(150)
-    return if (result == "misshithithitmisshit!") "OK" else "fail"
+    if (result != "misshithithitmisshit!") return "fail1: $result"
+    result = testFun2(-1) + testFun2(0) + testFun2(9) + testFun2(10)
+    if (result != "hitmissmisshit") return "fail2: $result"
+    return "OK"
 }
 fun testFun(index: Int): String {
     var lower = Wrapper(0)
@@ -16,6 +19,12 @@ fun testFun(index: Int): String {
         else -> "miss"
     }
 }
+fun testFun2(index: Int): String {
+    return when (Wrapper(index)) {
+        !in Wrapper(0)..Wrapper(9) -> "hit"
+        else -> "miss"
+    }
+}
 
 class Wrapper(val value: Int) : Comparable<Wrapper> {
     operator fun rangeTo(upper: Wrapper) = WrapperRange(this, upper)
diff --git a/js/js.translator/testData/expression/when/cases/whenWithRangeClause.kt b/js/js.translator/testData/expression/when/cases/whenWithRangeClause.kt
index 9aacd416fd3..c2cb960542d 100644
--- a/js/js.translator/testData/expression/when/cases/whenWithRangeClause.kt
+++ b/js/js.translator/testData/expression/when/cases/whenWithRangeClause.kt
@@ -4,7 +4,10 @@ package foo
 
 fun box(): String {
     var result = testFun(-1) + testFun(0) + testFun(5) + testFun(9) + testFun(10) + testFun(150) + testFun(800)
-    return if (result == "misshithithitmisshit!@@@" && invocationCount == 7) "OK" else "fail"
+    if (result != "misshithithitmisshit!@@@" || invocationCount != 7) return "fail1:" + result
+    result = testFun2(-1) + testFun2(0) + testFun2(9) + testFun2(10)
+    if (result != "hitmissmisshit") return "fail2:" + result
+    return "OK"
 }
 fun testFun(index: Int): String {
     val thirdRange = 500..1000
@@ -15,6 +18,12 @@ fun testFun(index: Int): String {
         else -> "miss"
     }
 }
+fun testFun2(index: Int): String {
+    return when(index) {
+        !in 0..9 -> "hit"
+        else -> "miss"
+    }
+}
 
 fun get(value: Int): Int {
     invocationCount++