diff --git a/video/out/gl_common.c b/video/out/gl_common.c
index 0477bb39c9..8be109f6e3 100644
--- a/video/out/gl_common.c
+++ b/video/out/gl_common.c
@@ -263,6 +263,8 @@ struct gl_functions gl_functions[] = {
             DEF_FN(UniformMatrix2fv),
             DEF_FN(UniformMatrix3fv),
             DEF_FN(TexImage3D),
+            // Added in OpenGL 1.4, but vo_opengl_old doesn't need it
+            DEF_FN(BlendFuncSeparate),
             {0},
         },
     },
diff --git a/video/out/gl_common.h b/video/out/gl_common.h
index 8d7d5a8252..6339b573b0 100644
--- a/video/out/gl_common.h
+++ b/video/out/gl_common.h
@@ -249,6 +249,7 @@ struct GL {
     void (GLAPIENTRY *DrawBuffer)(GLenum);
     void (GLAPIENTRY *DepthMask)(GLboolean);
     void (GLAPIENTRY *BlendFunc)(GLenum, GLenum);
+    void (GLAPIENTRY *BlendFuncSeparate)(GLenum, GLenum, GLenum, GLenum);
     void (GLAPIENTRY *Flush)(void);
     void (GLAPIENTRY *Finish)(void);
     void (GLAPIENTRY *PixelStorei)(GLenum, GLint);
diff --git a/video/out/gl_osd.c b/video/out/gl_osd.c
index 547a8b6789..99b64176ae 100644
--- a/video/out/gl_osd.c
+++ b/video/out/gl_osd.c
@@ -29,10 +29,12 @@ struct osd_fmt_entry {
     GLenum type;
 };
 
-// glBlendFunc() arguments
-static const int blend_factors[SUBBITMAP_COUNT][2] = {
-    [SUBBITMAP_LIBASS] = {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA},
-    [SUBBITMAP_RGBA] =   {GL_ONE,       GL_ONE_MINUS_SRC_ALPHA},
+// glBlendFuncSeparate() arguments
+static const int blend_factors[SUBBITMAP_COUNT][4] = {
+    [SUBBITMAP_LIBASS] = {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
+                          GL_ONE,       GL_ONE_MINUS_SRC_ALPHA},
+    [SUBBITMAP_RGBA] =   {GL_ONE,       GL_ONE_MINUS_SRC_ALPHA,
+                          GL_ONE,       GL_ONE_MINUS_SRC_ALPHA},
 };
 
 static const struct osd_fmt_entry osd_to_gl3_formats[SUBBITMAP_COUNT] = {
@@ -230,7 +232,13 @@ void mpgl_osd_set_gl_state(struct mpgl_osd *ctx, struct mpgl_osd_part *p)
 
     gl->BindTexture(GL_TEXTURE_2D, p->texture);
     gl->Enable(GL_BLEND);
-    gl->BlendFunc(blend_factors[p->format][0], blend_factors[p->format][1]);
+
+    const int *factors = &blend_factors[p->format][0];
+    if (gl->BlendFuncSeparate) {
+        gl->BlendFuncSeparate(factors[0], factors[1], factors[2], factors[3]);
+    } else {
+        gl->BlendFunc(factors[0], factors[1]);
+    }
 }
 
 void mpgl_osd_unset_gl_state(struct mpgl_osd *ctx, struct mpgl_osd_part *p)