diff --git a/compiler/frontend/src/jet/Ranges.jet b/compiler/frontend/src/jet/Ranges.jet
index 516ad722bfb..d8cc3edb9d6 100644
--- a/compiler/frontend/src/jet/Ranges.jet
+++ b/compiler/frontend/src/jet/Ranges.jet
@@ -56,7 +56,9 @@ public class CharRange(public override val start : Char, public override val end
     }
 }
 
-public class FloatRange(public override val start : Float, public override val end : Float) : Range<Float> {
+public class FloatRange(public override val start : Float, public override val end : Float) : Range<Float>, FloatIterable {
+    public override fun iterator () : FloatIterator
+
     public override fun contains (elem: Float) : Boolean
 
     public class object {
@@ -64,7 +66,9 @@ public class FloatRange(public override val start : Float, public override val e
     }
 }
 
-public class DoubleRange(public override val start : Double, public override val end : Double) : Range<Double> {
+public class DoubleRange(public override val start : Double, public override val end : Double) : Range<Double>, DoubleIterable {
+    public override fun iterator () : DoubleIterator
+
     public override fun contains (elem: Double) : Boolean
 
     public class object {
diff --git a/runtime/src/jet/DoubleRange.java b/runtime/src/jet/DoubleRange.java
index 75ed2328c79..9dcbe36a843 100644
--- a/runtime/src/jet/DoubleRange.java
+++ b/runtime/src/jet/DoubleRange.java
@@ -19,7 +19,7 @@ package jet;
 import org.jetbrains.jet.rt.annotation.AssertInvisibleInResolver;
 
 @AssertInvisibleInResolver
-public final class DoubleRange implements Range<Double> {
+public final class DoubleRange implements Range<Double>, DoubleIterable {
     private final double start;
     private final double end;
 
@@ -74,4 +74,9 @@ public final class DoubleRange implements Range<Double> {
     public Double getEnd() {
         return end;
     }
+
+    @Override
+    public DoubleIterator iterator() {
+        return new DoubleSequenceIterator(getStart(), getEnd(), 1);
+    }
 }
diff --git a/runtime/src/jet/FloatRange.java b/runtime/src/jet/FloatRange.java
index d803f307737..418bfe256a1 100644
--- a/runtime/src/jet/FloatRange.java
+++ b/runtime/src/jet/FloatRange.java
@@ -19,7 +19,7 @@ package jet;
 import org.jetbrains.jet.rt.annotation.AssertInvisibleInResolver;
 
 @AssertInvisibleInResolver
-public final class FloatRange implements Range<Float> {
+public final class FloatRange implements Range<Float>, FloatIterable {
     private final float start;
     private final float end;
 
@@ -70,4 +70,9 @@ public final class FloatRange implements Range<Float> {
     public Float getEnd() {
         return end;
     }
+
+    @Override
+    public FloatIterator iterator() {
+        return new FloatSequenceIterator(getStart(), getEnd(), 1);
+    }
 }