diff --git a/gtk/gtkcsscolor.c b/gtk/gtkcsscolor.c
index b76b1f855a..e8495555ff 100644
--- a/gtk/gtkcsscolor.c
+++ b/gtk/gtkcsscolor.c
@@ -1009,6 +1009,12 @@ parse_hue_interpolation (GtkCssParser           *parser,
   return TRUE;
 }
 
+gboolean
+gtk_css_color_interpolation_method_can_parse (GtkCssParser *parser)
+{
+  return gtk_css_token_is_ident (gtk_css_parser_get_token (parser), "in");
+}
+
 gboolean
 gtk_css_color_interpolation_method_parse (GtkCssParser           *parser,
                                           GtkCssColorSpace       *in,
diff --git a/gtk/gtkcsscolorprivate.h b/gtk/gtkcsscolorprivate.h
index 1a7cf6277a..5b88a023ac 100644
--- a/gtk/gtkcsscolorprivate.h
+++ b/gtk/gtkcsscolorprivate.h
@@ -105,6 +105,8 @@ void gtk_css_color_space_get_coord_range (GtkCssColorSpace  color_space,
                                           float            *lower,
                                           float            *upper);
 
+gboolean gtk_css_color_interpolation_method_can_parse (GtkCssParser *parser);
+
 gboolean gtk_css_color_interpolation_method_parse (GtkCssParser           *parser,
                                                    GtkCssColorSpace       *in,
                                                    GtkCssHueInterpolation *interp);