diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 40395062d8..31f67e7154 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+#### 1.9.2 - 01.06.2015
+* Do not duplicate files in the nupkg - https://github.com/fsprojects/Paket/issues/851
+
 #### 1.9.1 - 01.06.2015
 * Pack command reuses project version if directly given - https://github.com/fsprojects/Paket/issues/837
 
diff --git a/src/Paket.Core/NupkgWriter.fs b/src/Paket.Core/NupkgWriter.fs
index ca19b13017..64aee01a45 100644
--- a/src/Paket.Core/NupkgWriter.fs
+++ b/src/Paket.Core/NupkgWriter.fs
@@ -242,7 +242,10 @@ let Write (core : CompleteCoreInfo) optional workingDir outputDir =
     for path, writer in writeNupkg core optional do 
         addEntry zipFile path writer
     
-    contentTypeDoc (Seq.toList entries)
+    entries
+    |> Seq.distinct
+    |> Seq.toList
+    |> contentTypeDoc
     |> xDocWriter
     |> addEntry zipFile contentTypePath