diff --git a/presto-main/src/main/java/com/facebook/presto/type/CharOperators.java b/presto-main/src/main/java/com/facebook/presto/type/CharOperators.java
index 6bffa6987e27b..ad407a6dd0fe7 100644
--- a/presto-main/src/main/java/com/facebook/presto/type/CharOperators.java
+++ b/presto-main/src/main/java/com/facebook/presto/type/CharOperators.java
@@ -31,6 +31,7 @@
 import static com.facebook.presto.spi.function.OperatorType.LESS_THAN;
 import static com.facebook.presto.spi.function.OperatorType.LESS_THAN_OR_EQUAL;
 import static com.facebook.presto.spi.function.OperatorType.NOT_EQUAL;
+import static com.facebook.presto.spi.function.OperatorType.XX_HASH_64;
 import static com.facebook.presto.spi.type.Chars.compareChars;
 
 public final class CharOperators
@@ -101,6 +102,14 @@ public static long hashCode(@SqlType("char(x)") Slice value)
         return XxHash64.hash(value);
     }
 
+    @LiteralParameters("x")
+    @ScalarOperator(XX_HASH_64)
+    @SqlType(StandardTypes.BIGINT)
+    public static long xxHash64(@SqlType("char(x)") Slice slice)
+    {
+        return XxHash64.hash(slice);
+    }
+
     @LiteralParameters({"x"})
     @ScalarOperator(IS_DISTINCT_FROM)
     @SqlType(StandardTypes.BOOLEAN)
diff --git a/presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestAggregations.java b/presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestAggregations.java
index 3e472fe94c7a4..0b591bbd304d0 100644
--- a/presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestAggregations.java
+++ b/presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestAggregations.java
@@ -720,6 +720,10 @@ public void testApproximateCountDistinct()
         assertQuery("SELECT approx_distinct(CAST(custkey AS VARCHAR)) FROM orders", "SELECT 1036");
         assertQuery("SELECT approx_distinct(CAST(custkey AS VARCHAR), 0.023) FROM orders", "SELECT 1036");
 
+        // test char
+        assertQuery("SELECT approx_distinct(CAST(CAST(custkey AS VARCHAR) AS CHAR(20))) FROM orders", "SELECT 1036");
+        assertQuery("SELECT approx_distinct(CAST(CAST(custkey AS VARCHAR) AS CHAR(20)), 0.023) FROM orders", "SELECT 1036");
+
         // test varbinary
         assertQuery("SELECT approx_distinct(to_utf8(CAST(custkey AS VARCHAR))) FROM orders", "SELECT 1036");
         assertQuery("SELECT approx_distinct(to_utf8(CAST(custkey AS VARCHAR)), 0.023) FROM orders", "SELECT 1036");