diff --git a/spec/DecodeEventsSpec.hs b/spec/DecodeEventsSpec.hs
index 12bb2a0..35fd2d3 100644
--- a/spec/DecodeEventsSpec.hs
+++ b/spec/DecodeEventsSpec.hs
@@ -94,7 +94,7 @@ checkSuiteEventFixture = CheckSuiteEvent
           , whCheckSuiteConclusion = Just HookCheckSuiteConclusionActionRequired
           , whCheckSuiteUrl = URL "https://api.github.com/repos/baxterthehacker/public-repo/check-suites/123451234"
           , whCheckSuiteBeforeSha = Just "15c99c3e0b9d840d8465be47813cf39686815f2e"
-          , whCheckSuiteAfterSha = "45deaf5013c757e58e2665849c3fd3add3edfa59"
+          , whCheckSuiteAfterSha = Just "45deaf5013c757e58e2665849c3fd3add3edfa59"
           , whCheckSuitePullRequests =
               V.fromList [
                 HookChecksPullRequest
@@ -315,7 +315,7 @@ checkRunEventFixture = CheckRunEvent
                 , whCheckSuiteConclusion = Nothing
                 , whCheckSuiteUrl = URL "https://api.github.com/repos/baxterthehacker/public-repo/check-suites/123451234"
                 , whCheckSuiteBeforeSha = Just "15c99c3e0b9d840d8465be47813cf39686815f2e"
-                , whCheckSuiteAfterSha = "45deaf5013c757e58e2665849c3fd3add3edfa59"
+                , whCheckSuiteAfterSha = Just "45deaf5013c757e58e2665849c3fd3add3edfa59"
                 , whCheckSuitePullRequests =
                     V.fromList [
                       HookChecksPullRequest
diff --git a/src/GitHub/Data/Webhooks/Payload.hs b/src/GitHub/Data/Webhooks/Payload.hs
index 4a1a628..baca996 100644
--- a/src/GitHub/Data/Webhooks/Payload.hs
+++ b/src/GitHub/Data/Webhooks/Payload.hs
@@ -601,7 +601,7 @@ data HookCheckSuite = HookCheckSuite
     , whCheckSuiteConclusion           :: !(Maybe HookCheckSuiteConclusion)
     , whCheckSuiteUrl                  :: !URL
     , whCheckSuiteBeforeSha            :: !(Maybe Text)
-    , whCheckSuiteAfterSha             :: !Text
+    , whCheckSuiteAfterSha             :: !(Maybe Text)
     , whCheckSuitePullRequests         :: !(Vector HookChecksPullRequest)
     , whCheckSuiteCreatedAt            :: !UTCTime
     , whCheckSuiteUpdatedAt            :: !UTCTime
@@ -1310,7 +1310,7 @@ instance FromJSON HookCheckSuite where
       <*> o .:? "conclusion"
       <*> o .: "url"
       <*> o .:? "before"
-      <*> o .: "after"
+      <*> o .:? "after"
       <*> o .: "pull_requests"
       <*> o .: "created_at"
       <*> o .: "updated_at"