diff --git a/common/src/main/java/io/netty/util/AsciiString.java b/common/src/main/java/io/netty/util/AsciiString.java
index 3d3e1fbc21..f53746960a 100644
--- a/common/src/main/java/io/netty/util/AsciiString.java
+++ b/common/src/main/java/io/netty/util/AsciiString.java
@@ -1452,8 +1452,8 @@ public final class AsciiString implements CharSequence, Comparable<CharSequence>
         if (a.length() != b.length()) {
             return false;
         }
-        for (int i = 0, j = 0; i < a.length(); ++i, ++j) {
-            if (!equalsIgnoreCase(a.charAt(i),  b.charAt(j))) {
+        for (int i = 0; i < a.length(); ++i) {
+            if (!equalsIgnoreCase(a.charAt(i),  b.charAt(i))) {
                 return false;
             }
         }
diff --git a/common/src/test/java/io/netty/util/AsciiStringCharacterTest.java b/common/src/test/java/io/netty/util/AsciiStringCharacterTest.java
index cdd962d354..c2a835df66 100644
--- a/common/src/test/java/io/netty/util/AsciiStringCharacterTest.java
+++ b/common/src/test/java/io/netty/util/AsciiStringCharacterTest.java
@@ -240,6 +240,9 @@ public class AsciiStringCharacterTest {
         assertThat(AsciiString.contentEqualsIgnoreCase(null, "foo"), is(false));
         assertThat(AsciiString.contentEqualsIgnoreCase("bar", null), is(false));
         assertThat(AsciiString.contentEqualsIgnoreCase("FoO", "fOo"), is(true));
+        assertThat(AsciiString.contentEqualsIgnoreCase("FoO", "bar"), is(false));
+        assertThat(AsciiString.contentEqualsIgnoreCase("Foo", "foobar"), is(false));
+        assertThat(AsciiString.contentEqualsIgnoreCase("foobar", "Foo"), is(false));
 
         // Test variations (Ascii + String, Ascii + Ascii, String + Ascii)
         assertThat(AsciiString.contentEqualsIgnoreCase(new AsciiString("FoO"), "fOo"), is(true));