diff --git a/libgimpcolor/gimpcolor.def b/libgimpcolor/gimpcolor.def
index ff79d30b69..e4370d741f 100644
--- a/libgimpcolor/gimpcolor.def
+++ b/libgimpcolor/gimpcolor.def
@@ -46,6 +46,7 @@ EXPORTS
 	gimp_rgb_set_uchar
 	gimp_rgb_set_uchar
 	gimp_rgb_subtract
+	gimp_rgb_to_cmyk
 	gimp_rgb_to_hls_int
 	gimp_rgb_to_hsl
 	gimp_rgb_to_hsv