diff --git a/runtime/src/jet/ByteProgressionIterator.java b/runtime/src/jet/ByteProgressionIterator.java
index fc5fc8417bc..d2461dab02a 100644
--- a/runtime/src/jet/ByteProgressionIterator.java
+++ b/runtime/src/jet/ByteProgressionIterator.java
@@ -29,7 +29,7 @@ class ByteProgressionIterator extends ByteIterator {
         this.increment = increment;
 
         this.finalElement = (byte) ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override
diff --git a/runtime/src/jet/CharProgressionIterator.java b/runtime/src/jet/CharProgressionIterator.java
index cb09aeb5347..1b5306db656 100644
--- a/runtime/src/jet/CharProgressionIterator.java
+++ b/runtime/src/jet/CharProgressionIterator.java
@@ -29,7 +29,7 @@ class CharProgressionIterator extends CharIterator {
         this.increment = increment;
 
         this.finalElement = (char) ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override
diff --git a/runtime/src/jet/IntProgressionIterator.java b/runtime/src/jet/IntProgressionIterator.java
index 0b6f9bb5175..a6a0c9da842 100644
--- a/runtime/src/jet/IntProgressionIterator.java
+++ b/runtime/src/jet/IntProgressionIterator.java
@@ -29,7 +29,7 @@ class IntProgressionIterator extends IntIterator {
         this.increment = increment;
 
         this.finalElement = ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override
diff --git a/runtime/src/jet/LongProgressionIterator.java b/runtime/src/jet/LongProgressionIterator.java
index 70493e39972..a2593216be1 100644
--- a/runtime/src/jet/LongProgressionIterator.java
+++ b/runtime/src/jet/LongProgressionIterator.java
@@ -29,7 +29,7 @@ class LongProgressionIterator extends LongIterator {
         this.increment = increment;
 
         this.finalElement = ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override
diff --git a/runtime/src/jet/ShortProgressionIterator.java b/runtime/src/jet/ShortProgressionIterator.java
index d3da9e80326..bb63d7788c0 100644
--- a/runtime/src/jet/ShortProgressionIterator.java
+++ b/runtime/src/jet/ShortProgressionIterator.java
@@ -29,7 +29,7 @@ class ShortProgressionIterator extends ShortIterator {
         this.increment = increment;
 
         this.finalElement = (short) ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override