diff --git a/libgimpwidgets/gimpnumberpairentry.c b/libgimpwidgets/gimpnumberpairentry.c
index 210cbc30b9..2be2f6a100 100644
--- a/libgimpwidgets/gimpnumberpairentry.c
+++ b/libgimpwidgets/gimpnumberpairentry.c
@@ -367,7 +367,7 @@ gimp_number_pair_entry_get_ratio (GimpNumberPairEntry *entry)
 {
   GimpNumberPairEntryPrivate *priv;
 
-  g_return_val_if_fail (GIMP_IS_NUMBER_PAIR_ENTRY (entry), 0.0);
+  g_return_val_if_fail (GIMP_IS_NUMBER_PAIR_ENTRY (entry), 1.0);
 
   priv = GIMP_NUMBER_PAIR_ENTRY_GET_PRIVATE (entry);