diff --git a/ext/gl/gstglvideomixer.c b/ext/gl/gstglvideomixer.c
index 2256e549b5..0306d22e53 100644
--- a/ext/gl/gstglvideomixer.c
+++ b/ext/gl/gstglvideomixer.c
@@ -162,7 +162,7 @@ gst_gl_video_mixer_blend_function_get_type (void)
 #define DEFAULT_PAD_BLEND_EQUATION_RGB GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD
 #define DEFAULT_PAD_BLEND_EQUATION_ALPHA GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD
 #define DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA
-#define DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA
+#define DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE
 #define DEFAULT_PAD_BLEND_FUNCTION_DST_RGB GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA
 #define DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA