diff --git a/mozglue/build/Authenticode.cpp b/mozglue/build/Authenticode.cpp
index 811035b7773f..ea4fd78a706f 100644
--- a/mozglue/build/Authenticode.cpp
+++ b/mozglue/build/Authenticode.cpp
@@ -265,7 +265,8 @@ SignedBinary::VerifySignature(const wchar_t* aFilePath)
 
   // Now we need to hash the file at aFilePath.
   // Since we're hashing this file, let's open it with a sequential scan hint.
-  HANDLE rawFile = ::CreateFileW(aFilePath, GENERIC_READ, FILE_SHARE_READ,
+  HANDLE rawFile = ::CreateFileW(aFilePath, GENERIC_READ,
+                                 FILE_SHARE_READ | FILE_SHARE_DELETE | FILE_SHARE_WRITE,
                                  nullptr, OPEN_EXISTING,
                                  FILE_FLAG_SEQUENTIAL_SCAN, nullptr);
   if (rawFile == INVALID_HANDLE_VALUE) {