diff --git a/plugins/GCodeGzReader/GCodeGzReader.py b/plugins/GCodeGzReader/GCodeGzReader.py
index 73a08075d2..4d33f00870 100644
--- a/plugins/GCodeGzReader/GCodeGzReader.py
+++ b/plugins/GCodeGzReader/GCodeGzReader.py
@@ -4,8 +4,16 @@
 import gzip
 
 from UM.Mesh.MeshReader import MeshReader #The class we're extending/implementing.
+from UM.MimeTypeDatabase import MimeTypeDatabase, MimeType #To add the .gcode.gz files to the MIME type database.
 from UM.PluginRegistry import PluginRegistry
 
+MimeTypeDatabase.addMimeType(
+    MimeType(
+        name = "application/x-cura-compressed-gcode-file",
+        comment = "Cura Compressed GCode File",
+        suffixes = ["gcode.gz"]
+    )
+)
 
 ##  A file reader that reads gzipped g-code.
 #
diff --git a/plugins/GCodeReader/GCodeReader.py b/plugins/GCodeReader/GCodeReader.py
index 45ef1e1058..498c425f68 100755
--- a/plugins/GCodeReader/GCodeReader.py
+++ b/plugins/GCodeReader/GCodeReader.py
@@ -1,4 +1,5 @@
 # Copyright (c) 2017 Aleph Objects, Inc.
+# Copyright (c) 2018 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
 from UM.FileHandler.FileReader import FileReader
@@ -15,7 +16,7 @@ MimeTypeDatabase.addMimeType(
     MimeType(
         name = "application/x-cura-gcode-file",
         comment = "Cura GCode File",
-        suffixes = ["gcode", "gcode.gz"]
+        suffixes = ["gcode"]
     )
 )