diff --git a/JexlNet.ExtendedGrammar/ExtendedGrammar.cs b/JexlNet.ExtendedGrammar/ExtendedGrammar.cs
index d74fdd3..8ad4e3e 100644
--- a/JexlNet.ExtendedGrammar/ExtendedGrammar.cs
+++ b/JexlNet.ExtendedGrammar/ExtendedGrammar.cs
@@ -594,11 +594,11 @@ public static JsonNode Join(JsonNode input, JsonNode separator)
         /// <returns>A string with all occurrences of old replaced by new</returns>
         public static JsonNode Replace(JsonNode input, JsonNode old, JsonNode newStr)
         {
-            if (input is JsonValue value && old is JsonValue oldValue && newStr is JsonValue newValue)
+            if (input is JsonValue value && old is JsonValue oldValue)
             {
                 string str = value.ToString();
                 string oldStr = oldValue.ToString();
-                string newStrStr = newValue.ToString();
+                string newStrStr = newStr is JsonValue newValue ? newValue.ToString() : "";
                 return str.Replace(oldStr, newStrStr);
             }
             return null;
diff --git a/JexlNet.Test/ExtendedGrammar.cs b/JexlNet.Test/ExtendedGrammar.cs
index b225f21..dbe14af 100644
--- a/JexlNet.Test/ExtendedGrammar.cs
+++ b/JexlNet.Test/ExtendedGrammar.cs
@@ -106,6 +106,17 @@ public void Contains(string expression, bool expected)
         Assert.Equal(expected, result);
     }
 
+    [Theory]
+    [InlineData("replace('foo-bar', '-', '_')", "foo_bar")]
+    [InlineData("replace('foo-bar----', '-', '')", "foobar")]
+    [InlineData("'123ab123ab123ab'|replace('123')", "ababab")]
+    public void Replace(string expression, string expected)
+    {
+        var jexl = new Jexl(new ExtendedGrammar());
+        var result = jexl.Eval(expression);
+        Assert.Equal(expected, result?.ToString());
+    }
+
     [Fact]
     public void Split()
     {