diff --git a/gdk/gdkmemoryformat.c b/gdk/gdkmemoryformat.c
index 5af2bb8516..5ee530654f 100644
--- a/gdk/gdkmemoryformat.c
+++ b/gdk/gdkmemoryformat.c
@@ -274,7 +274,7 @@ static const GdkMemoryFormatDescription memory_formats[GDK_MEMORY_N_FORMATS] = {
     G_ALIGNOF (guchar),
     FALSE,
     TRUE,
-    { GL_RGBA8, GL_RGB, GL_UNSIGNED_BYTE },
+    { GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE },
     r8g8b8_to_float,
     r8g8b8_from_float,
   },