diff --git a/src/main/java/org/apache/commons/collections/trie/ByteKeyAnalyzer.java b/src/main/java/org/apache/commons/collections/trie/ByteKeyAnalyzer.java
index 2744a5b14..5f4f0efff 100644
--- a/src/main/java/org/apache/commons/collections/trie/ByteKeyAnalyzer.java
+++ b/src/main/java/org/apache/commons/collections/trie/ByteKeyAnalyzer.java
@@ -66,7 +66,7 @@ public class ByteKeyAnalyzer extends AbstractKeyAnalyzer<Byte> {
      * {@inheritDoc}
      */
     public boolean isBitSet(final Byte key, final int bitIndex, final int lengthInBits) {
-        return (key & mask(bitIndex)) != 0;
+        return (key.intValue() & mask(bitIndex)) != 0;
     }
 
     /**
diff --git a/src/main/java/org/apache/commons/collections/trie/IntegerKeyAnalyzer.java b/src/main/java/org/apache/commons/collections/trie/IntegerKeyAnalyzer.java
index 2811059ad..ad0db207b 100644
--- a/src/main/java/org/apache/commons/collections/trie/IntegerKeyAnalyzer.java
+++ b/src/main/java/org/apache/commons/collections/trie/IntegerKeyAnalyzer.java
@@ -66,7 +66,7 @@ public class IntegerKeyAnalyzer extends AbstractKeyAnalyzer<Integer> {
      * {@inheritDoc}
      */
     public boolean isBitSet(final Integer key, final int bitIndex, final int lengthInBits) {
-        return (key & mask(bitIndex)) != 0;
+        return (key.intValue() & mask(bitIndex)) != 0;
     }
 
     /**
diff --git a/src/main/java/org/apache/commons/collections/trie/LongKeyAnalyzer.java b/src/main/java/org/apache/commons/collections/trie/LongKeyAnalyzer.java
index 1a2b7ccb8..03b26a32e 100644
--- a/src/main/java/org/apache/commons/collections/trie/LongKeyAnalyzer.java
+++ b/src/main/java/org/apache/commons/collections/trie/LongKeyAnalyzer.java
@@ -66,7 +66,7 @@ public class LongKeyAnalyzer extends AbstractKeyAnalyzer<Long> {
      * {@inheritDoc}
      */
     public boolean isBitSet(final Long key, final int bitIndex, final int lengthInBits) {
-        return (key & mask(bitIndex)) != 0;
+        return (key.longValue() & mask(bitIndex)) != 0;
     }
 
     /**
diff --git a/src/main/java/org/apache/commons/collections/trie/ShortKeyAnalyzer.java b/src/main/java/org/apache/commons/collections/trie/ShortKeyAnalyzer.java
index 652811638..f936b7447 100644
--- a/src/main/java/org/apache/commons/collections/trie/ShortKeyAnalyzer.java
+++ b/src/main/java/org/apache/commons/collections/trie/ShortKeyAnalyzer.java
@@ -66,7 +66,7 @@ public class ShortKeyAnalyzer implements KeyAnalyzer<Short> {
      * {@inheritDoc}
      */
     public boolean isBitSet(final Short key, final int bitIndex, final int lengthInBits) {
-        return (key & mask(bitIndex)) != 0;
+        return (key.intValue() & mask(bitIndex)) != 0;
     }
 
     /**