diff --git a/dll/win32/msi/source.c b/dll/win32/msi/source.c
index 68bf9d0a226..7f55775b05d 100644
--- a/dll/win32/msi/source.c
+++ b/dll/win32/msi/source.c
@@ -98,6 +98,7 @@ static UINT OpenSourceKey(LPCWSTR szProduct, HKEY* key, DWORD dwOptions,
         if (rc != ERROR_SUCCESS)
             rc = ERROR_BAD_CONFIGURATION;
     }
+    RegCloseKey(rootkey);
 
     return rc;
 }