diff --git a/moo/mooedit/mooeditfileops.c b/moo/mooedit/mooeditfileops.c
index 1d39d69a..e9b8805b 100644
--- a/moo/mooedit/mooeditfileops.c
+++ b/moo/mooedit/mooeditfileops.c
@@ -338,7 +338,7 @@ moo_edit_load_default (G_GNUC_UNUSED MooEditLoader *loader,
 
     if (!encoding)
     {
-        result = try_load (edit, file, "UTF8", error);
+        result = try_load (edit, file, "UTF-8", error);
 
         if (result == ERROR_ENCODING)
         {
@@ -732,7 +732,7 @@ moo_edit_save_default (G_GNUC_UNUSED MooEditSaver *saver,
     g_return_val_if_fail (filename && filename[0], FALSE);
 
     if (!encoding)
-        encoding = "UTF8";
+        encoding = "UTF-8";
 
     if (!do_write (edit, filename, encoding, error))
         return FALSE;
@@ -755,7 +755,7 @@ moo_edit_save_copy_default (G_GNUC_UNUSED MooEditSaver *saver,
 {
     g_return_val_if_fail (MOO_IS_EDIT (edit), FALSE);
     g_return_val_if_fail (filename && filename[0], FALSE);
-    return do_write (edit, filename, encoding ? encoding : "UTF8", error);
+    return do_write (edit, filename, encoding ? encoding : "UTF-8", error);
 }
 
 
@@ -1174,7 +1174,7 @@ _moo_edit_filename_to_utf8 (const char *filename)
 
     if (!utf_filename)
     {
-        g_critical ("%s: could not convert filename to utf8", G_STRLOC);
+        g_critical ("%s: could not convert filename to UTF8", G_STRLOC);
 
         if (err)
         {
diff --git a/moo/mooutils/moospawn.c b/moo/mooutils/moospawn.c
index de6e536c..0a0ea424 100644
--- a/moo/mooutils/moospawn.c
+++ b/moo/mooutils/moospawn.c
@@ -277,12 +277,12 @@ process_line (MooCmd      *cmd,
         {
             GError *error = NULL;
 
-            freeme = g_convert_with_fallback (line, -1, "UTF8", charset,
+            freeme = g_convert_with_fallback (line, -1, "UTF-8", charset,
                                               NULL, NULL, NULL, &error);
 
             if (!freeme)
             {
-                g_warning ("%s: could not convert text to UTF8:\n%s",
+                g_warning ("%s: could not convert text to UTF-8:\n%s",
                            G_STRLOC, line);
                 g_warning ("%s: %s", G_STRLOC, error->message);
             }