diff --git a/app/core/gimp-memsize.c b/app/core/gimp-memsize.c
index 86f5d92f38..01a25c5b6a 100644
--- a/app/core/gimp-memsize.c
+++ b/app/core/gimp-memsize.c
@@ -206,11 +206,7 @@ gimp_g_value_get_memsize (GValue *value)
     }
   else if (G_VALUE_HOLDS_BOXED (value))
     {
-      if (GIMP_VALUE_HOLDS_RGB (value))
-        {
-          memsize += sizeof (GimpRGB);
-        }
-      else if (GIMP_VALUE_HOLDS_MATRIX2 (value))
+      if (GIMP_VALUE_HOLDS_MATRIX2 (value))
         {
           memsize += sizeof (GimpMatrix2);
         }
diff --git a/libgimpcolor/gimprgb.h b/libgimpcolor/gimprgb.h
index e7903051de..07bf3cc40f 100644
--- a/libgimpcolor/gimprgb.h
+++ b/libgimpcolor/gimprgb.h
@@ -33,7 +33,6 @@ G_BEGIN_DECLS
  */
 
 #define GIMP_TYPE_RGB               (gimp_rgb_get_type ())
-#define GIMP_VALUE_HOLDS_RGB(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_RGB))
 
 GType   gimp_rgb_get_type           (void) G_GNUC_CONST;