diff --git a/data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/JacksonEventKey.java b/data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/JacksonEventKey.java
index 4da385b3e6..a31c615c99 100644
--- a/data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/JacksonEventKey.java
+++ b/data-prepper-api/src/main/java/org/opensearch/dataprepper/model/event/JacksonEventKey.java
@@ -28,7 +28,7 @@ class JacksonEventKey implements EventKey {
     private JsonPointer jsonPointer;
     private final Set<EventKeyFactory.EventAction> supportedActions;
     private static final Pattern INVALID_KEY_CHARS_PATTERN =
-            Pattern.compile("[^A-Za-z0-9._~@/\\[\\]-]");
+            Pattern.compile("[^A-Za-z0-9._~@/\\[\\]\\(\\)-]");
 
     /**
      * Constructor for the JacksonEventKey which should only be used by implementation
@@ -182,6 +182,8 @@ private static boolean isValidKey(final String key) {
                     || c == ']'
                     || c == ' '
                     || c == '$'
+                    || c == '('
+                    || c == ')'
             )) {
 
                 return false;
diff --git a/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventKeyTest.java b/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventKeyTest.java
index 8f46f0135f..3ebb5b997b 100644
--- a/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventKeyTest.java
+++ b/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventKeyTest.java
@@ -53,7 +53,6 @@ void constructor_throws_with_empty_string_for_unsupported_actions(final EventKey
 
     @ParameterizedTest
     @ValueSource(strings = {
-            "inv(alid",
             "getMetadata(\"test_key\")"
     })
     void constructor_throws_with_invalid_key(final String key) {
@@ -152,7 +151,6 @@ void supports_returns_true_if_any_supports(final List<EventKeyFactory.EventActio
     @CsvSource(value = {
             "test_key, true",
             "/test_key, true",
-            "inv(alid, false",
             "getMetadata(\"test_key\"), false",
             "key.with.dot, true",
             "key-with-hyphen, true",
@@ -164,7 +162,8 @@ void supports_returns_true_if_any_supports(final List<EventKeyFactory.EventActio
             " key_with_space_prefix, true",
             "key_with_space_suffix , true",
             "$key_with_dollar_prefix, true",
-            "key_with_dollar_suffix$, true"
+            "key_with_dollar_suffix$, true",
+            "key(withparentheses), true"
     })
     void isValidEventKey_returns_expected_result(final String key, final boolean isValid) {
         assertThat(JacksonEventKey.isValidEventKey(key), equalTo(isValid));
diff --git a/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventTest.java b/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventTest.java
index 05dc72c7c1..f041919102 100644
--- a/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventTest.java
+++ b/data-prepper-api/src/test/java/org/opensearch/dataprepper/model/event/JacksonEventTest.java
@@ -1225,7 +1225,6 @@ void testJsonStringBuilderWithExcludeKeys() {
     @ParameterizedTest
     @CsvSource(value = {"test_key, true",
             "/test_key, true",
-            "inv(alid, false",
             "getMetadata(\"test_key\"), false",
             "key.with.dot, true",
             "key-with-hyphen, true",