diff --git a/app/file/file-open.c b/app/file/file-open.c
index 45a853a344..764f7a83bc 100644
--- a/app/file/file-open.c
+++ b/app/file/file-open.c
@@ -809,5 +809,5 @@ file_open_file_proc_is_import (GimpPlugInProcedure *file_proc)
 {
   return !(file_proc &&
            file_proc->mime_type &&
-           strcmp (file_proc->mime_type, "image/xcf") == 0);
+           strcmp (file_proc->mime_type, "image/x-xcf") == 0);
 }
diff --git a/app/xcf/xcf.c b/app/xcf/xcf.c
index a2f34499fa..99b498e451 100644
--- a/app/xcf/xcf.c
+++ b/app/xcf/xcf.c
@@ -113,7 +113,7 @@ xcf_init (Gimp *gimp)
                                    strlen ("gimp-wilber") + 1);
   gimp_plug_in_procedure_set_image_types (proc, "RGB*, GRAY*, INDEXED*");
   gimp_plug_in_procedure_set_file_proc (proc, "xcf", "", NULL);
-  gimp_plug_in_procedure_set_mime_type (proc, "image/xcf");
+  gimp_plug_in_procedure_set_mime_type (proc, "image/x-xcf");
   gimp_plug_in_procedure_set_handles_uri (proc);
 
   gimp_object_set_static_name (GIMP_OBJECT (procedure), "gimp-xcf-save");
@@ -185,7 +185,7 @@ xcf_init (Gimp *gimp)
   gimp_plug_in_procedure_set_image_types (proc, NULL);
   gimp_plug_in_procedure_set_file_proc (proc, "xcf", "",
                                         "0,string,gimp\\040xcf\\040");
-  gimp_plug_in_procedure_set_mime_type (proc, "image/xcf");
+  gimp_plug_in_procedure_set_mime_type (proc, "image/x-xcf");
   gimp_plug_in_procedure_set_handles_uri (proc);
 
   gimp_object_set_static_name (GIMP_OBJECT (procedure), "gimp-xcf-load");