diff --git a/src/GH.hs b/src/GH.hs
index 805fc10e..f283d4ce 100644
--- a/src/GH.hs
+++ b/src/GH.hs
@@ -201,23 +201,34 @@ authFromToken = GH.OAuth . T.encodeUtf8
 authFrom :: UpdateEnv -> GH.Auth
 authFrom = authFromToken . U.githubToken . options
 
-checkExistingUpdatePR :: MonadIO m => UpdateEnv -> Text -> ExceptT Text m ()
-checkExistingUpdatePR env attrPath = do
+checkExistingUpdatePR :: MonadIO m => UpdateEnv -> Text -> Text -> ExceptT Text m ()
+checkExistingUpdatePR env attrPath srcUrl = do
   searchResult <-
     ExceptT $
       liftIO $
         GH.github (authFrom env) (GH.searchIssuesR search)
           & fmap (first (T.pack . show))
-  if T.length (openPRReport searchResult) == 0
-    then return ()
-    else
-      throwE
-        ( "There might already be an open PR for this update:\n"
-            <> openPRReport searchResult
-        )
+  when (T.length (openPRReport searchResult) /= 0)
+    (throwE
+    ( "There might already be an open PR for this update:\n"
+      <> openPRReport searchResult))
+
+  srcUrlSearchResult <-
+    ExceptT $
+      liftIO $
+        GH.github (authFrom env) (GH.searchIssuesR srcUrlSearch)
+          & fmap (first (T.pack . show))
+
+  when (srcUrl /= T.empty && T.length (openPRReport srcUrlSearchResult) /= 0)
+    (throwE
+    ( "There might already be an open PR for this update:\n"
+      <> openPRReport searchResult))
+
+  return ()
   where
     title = U.prTitle env attrPath
     search = [interpolate|repo:nixos/nixpkgs $title |]
+    srcUrlSearch = [interpolate|new src url: $srcUrl |]
     openPRReport searchResult =
       GH.searchResultResults searchResult
         & V.filter (GH.issueClosedAt >>> isNothing)
diff --git a/src/Update.hs b/src/Update.hs
index aa06dbdc..95c8aee2 100644
--- a/src/Update.hs
+++ b/src/Update.hs
@@ -247,8 +247,9 @@ checkExistingUpdate ::
   UpdateEnv ->
   Maybe Text ->
   Text ->
+  Text ->
   ExceptT Text IO ()
-checkExistingUpdate log updateEnv existingCommitMsg attrPath = do
+checkExistingUpdate log updateEnv existingCommitMsg srcUrl attrPath = do
   case existingCommitMsg of
     Nothing -> lift $ log "No auto update branch exists"
     Just msg -> do
@@ -263,7 +264,7 @@ checkExistingUpdate log updateEnv existingCommitMsg attrPath = do
   -- Note that this check looks for PRs with the same old and new
   -- version numbers, so it won't stop us from updating an existing PR
   -- if this run updates the package to a newer version.
-  GH.checkExistingUpdatePR updateEnv attrPath
+  GH.checkExistingUpdatePR updateEnv attrPath srcUrl
 
 updateAttrPath ::
   (Text -> IO ()) ->
@@ -277,6 +278,7 @@ updateAttrPath log mergeBase updateEnv@UpdateEnv {..} attrPath = do
 
   successOrFailure <- runExceptT $ do
     hasUpdateScript <- Nix.hasUpdateScript attrPath
+    oldSrcUrl <- Nix.getSrcUrl attrPath <|> pure ""
 
     existingCommitMsg <- fmap getAlt . execWriterT $
       whenBatch updateEnv do
@@ -286,7 +288,7 @@ updateAttrPath log mergeBase updateEnv@UpdateEnv {..} attrPath = do
           mbLastCommitMsg <- lift $ Git.findAutoUpdateBranchMessage packageName
           tell $ Alt mbLastCommitMsg
           unless hasUpdateScript do
-            lift $ checkExistingUpdate log updateEnv mbLastCommitMsg attrPath
+            lift $ checkExistingUpdate log updateEnv mbLastCommitMsg attrPath oldSrcUrl
 
     unless hasUpdateScript do
       Nix.assertNewerVersion updateEnv
@@ -310,7 +312,6 @@ updateAttrPath log mergeBase updateEnv@UpdateEnv {..} attrPath = do
     -- Get the original values for diffing purposes
     derivationContents <- liftIO $ T.readFile $ T.unpack derivationFile
     oldHash <- Nix.getOldHash attrPath <|> pure ""
-    oldSrcUrl <- Nix.getSrcUrl attrPath <|> pure ""
     oldRev <- Nix.getAttr Nix.Raw "rev" attrPath <|> pure ""
     oldVerMay <- rightMay `fmapRT` (lift $ runExceptT $ Nix.getAttr Nix.Raw "version" attrPath)
 
@@ -379,17 +380,18 @@ updateAttrPath log mergeBase updateEnv@UpdateEnv {..} attrPath = do
       assertNotUpdatedOn updateEnv' derivationFile "master"
       assertNotUpdatedOn updateEnv' derivationFile "staging"
       assertNotUpdatedOn updateEnv' derivationFile "staging-next"
+
     whenBatch updateEnv do
       when pr do
         when hasUpdateScript do
-          checkExistingUpdate log updateEnv' existingCommitMsg attrPath
+          checkExistingUpdate log updateEnv' existingCommitMsg attrPath newSrcUrl
 
     Nix.build attrPath
 
     --
     -- Publish the result
     lift . log $ "Successfully finished processing"
-    result <- Nix.resultLink  
+    result <- Nix.resultLink
     let opReport =
           if isJust skipOutpathBase
           then "Outpath calculations were skipped for this package; total number of rebuilds unknown."
@@ -455,6 +457,7 @@ publishPackage log updateEnv oldSrcUrl newSrcUrl attrPath result opReport prBase
           metaDescription
           metaHomepage
           metaChangelog
+          newSrcUrl
           rewriteMsgs
           releaseUrl
           compareUrl
@@ -494,6 +497,7 @@ prMessage ::
   Text ->
   Text ->
   Text ->
+  Text ->
   [Text] ->
   Text ->
   Text ->
@@ -507,7 +511,7 @@ prMessage ::
   Text ->
   Text ->
   Text
-prMessage updateEnv isBroken metaDescription metaHomepage metaChangelog rewriteMsgs releaseUrl compareUrl resultCheckReport commitRev attrPath maintainers resultPath opReport cveRep cachixTestInstructions nixpkgsReviewMsg =
+prMessage updateEnv isBroken metaDescription metaHomepage metaChangelog newSrcUrl rewriteMsgs releaseUrl compareUrl resultCheckReport commitRev attrPath maintainers resultPath opReport cveRep cachixTestInstructions nixpkgsReviewMsg =
   -- Some components of the PR description are pre-generated prior to calling
   -- because they require IO, but in general try to put as much as possible for
   -- the formatting into the pure function so that we can control the body
@@ -538,6 +542,8 @@ prMessage updateEnv isBroken metaDescription metaHomepage metaChangelog rewriteM
         if compareUrl == T.empty
           then ""
           else "- [Compare changes on GitHub](" <> compareUrl <> ")"
+      -- Needed for search of existing PRs
+      newSrcUrlLine = "- new src url: " <> newSrcUrl
       nixpkgsReviewSection =
         if nixpkgsReviewMsg == T.empty
           then "NixPkgs review skipped"
@@ -571,6 +577,8 @@ prMessage updateEnv isBroken metaDescription metaHomepage metaChangelog rewriteM
 
        ###### To inspect upstream changes
 
+       $newSrcUrlLine
+
        $releaseUrlMessage
 
        $compareUrlMessage