diff -r 5cee4cb5ad79 -r 11f3bb408051 ui/gtk/entry.c
--- a/ui/gtk/entry.c	Wed Nov 22 09:49:26 2017 +0100
+++ b/ui/gtk/entry.c	Wed Nov 22 12:59:13 2017 +0100
@@ -84,6 +84,11 @@
     if(step == 0) {
         step = 1;
     }
+#ifdef UI_GTK2LEGACY
+    if(min == max) {
+        max = min + 1;
+    }
+#endif
     GtkWidget *spin = gtk_spin_button_new_with_range(min, max, step);
     gtk_spin_button_set_digits(GTK_SPIN_BUTTON(spin), digits);
     if(var) {