diff --git a/gnucash/gnome-utils/gnc-dense-cal.c b/gnucash/gnome-utils/gnc-dense-cal.c
index f46a70d45c9..062f0b654d1 100644
--- a/gnucash/gnome-utils/gnc-dense-cal.c
+++ b/gnucash/gnome-utils/gnc-dense-cal.c
@@ -505,9 +505,9 @@ gnc_dense_cal_init(GncDenseCal *dcal)
            string into the gnucash.pot file when calling xgettext. */
 #define dgettext_noextract dgettext
         /* Translators: This string must not show up in gnucash.pot as
-           it is looked up in the "gtk20" translation domain
+           it is looked up in the "gtk30" translation domain
            instead. */
-        week_start_str = dgettext_noextract("gtk20", "calendar:week_start:0");
+        week_start_str = dgettext_noextract("gtk30", "calendar:week_start:0");
 #undef dgettext_noextract
 
         parts = g_strsplit(week_start_str, ":", 3);