diff --git a/clients/simple-client.c b/clients/simple-client.c
index 89718dfa..a64a482f 100644
--- a/clients/simple-client.c
+++ b/clients/simple-client.c
@@ -96,6 +96,7 @@ init_egl(struct display *display)
 		EGL_RED_SIZE, 1,
 		EGL_GREEN_SIZE, 1,
 		EGL_BLUE_SIZE, 1,
+		EGL_ALPHA_SIZE, 1,
 		EGL_DEPTH_SIZE, 1,
 		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 		EGL_NONE