diff --git a/gl/cogl-internal.h b/gl/cogl-internal.h
index 735e005ee..b4ef91a01 100644
--- a/gl/cogl-internal.h
+++ b/gl/cogl-internal.h
@@ -65,8 +65,4 @@ cogl_enable (gulong flags);
 gulong
 cogl_get_enable ();
 
-void
-cogl_blend_func (COGLenum src_factor,
-                 COGLenum dst_factor);
-
 #endif /* __COGL_INTERNAL_H */
diff --git a/gles/cogl-internal.h b/gles/cogl-internal.h
index 786e80f84..5ce41834f 100644
--- a/gles/cogl-internal.h
+++ b/gles/cogl-internal.h
@@ -89,8 +89,4 @@ cogl_enable (gulong flags);
 gulong
 cogl_get_enable ();
 
-void
-cogl_blend_func (COGLenum src_factor,
-                 COGLenum dst_factor);
-
 #endif /* __COGL_INTERNAL_H */