diff --git a/gphoto2/gphoto2-file.h b/gphoto2/gphoto2-file.h
index 81a4787d5..58455cbc1 100644
--- a/gphoto2/gphoto2-file.h
+++ b/gphoto2/gphoto2-file.h
@@ -47,6 +47,7 @@ extern "C" {
 #define GP_MIME_AVI       "video/x-msvideo"
 #define GP_MIME_CRW       "image/x-canon-raw"
 #define GP_MIME_CR2       "image/x-canon-cr2"
+#define GP_MIME_NEF       "image/x-nikon-nef"
 #define GP_MIME_UNKNOWN   "application/octet-stream"
 #define GP_MIME_EXIF      "application/x-exif"
 #define GP_MIME_MP3       "audio/mpeg"
diff --git a/libgphoto2/gphoto2-file.c b/libgphoto2/gphoto2-file.c
index 765dd96a2..74068b37e 100644
--- a/libgphoto2/gphoto2-file.c
+++ b/libgphoto2/gphoto2-file.c
@@ -1091,6 +1091,7 @@ gp_file_adjust_name_for_mime_type (CameraFile *file)
 		GP_MIME_AVI,  "avi",
 		GP_MIME_CRW,  "crw",
 		GP_MIME_CR2,  "cr2",
+		GP_MIME_NEF,  "nef",
 		GP_MIME_TXT,  "txt",
 		NULL};