diff --git a/DOCS/interface-changes.rst b/DOCS/interface-changes.rst
index 94bc6772f2..981a3254a9 100644
--- a/DOCS/interface-changes.rst
+++ b/DOCS/interface-changes.rst
@@ -30,6 +30,7 @@ Interface changes
     - remove shared-script-properties (user-data is a replacement)
     - add `--secondary-sub-delay`, decouple secondary subtitles from
       `--sub-delay`
+    - add the `--osd-bar-border-size` option
  --- mpv 0.37.0 ---
     - `--save-position-on-quit` and its associated commands now store state files
       in %LOCALAPPDATA% instead of %APPDATA% directory by default on Windows.
diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index f80fc77904..45dc0e317f 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -4265,6 +4265,12 @@ OSD
 ``--osd-bar-h=<0.1-50>``
     Height of the OSD bar, in percentage of the screen height (default: 3.125).
 
+``--osd-bar-border-size=<size>``
+    Size of the border of the OSD bar in scaled pixels (see ``--sub-font-size``
+    for details).
+
+    Default: 1.2.
+
 ``--osd-back-color=<color>``
     See ``--sub-color``. Color used for OSD text background.
 
diff --git a/options/options.c b/options/options.c
index 526ef7d634..be7d966a95 100644
--- a/options/options.c
+++ b/options/options.c
@@ -360,6 +360,7 @@ const struct m_sub_options mp_osd_render_sub_opts = {
         {"osd-bar-align-y", OPT_FLOAT(osd_bar_align_y), M_RANGE(-1.0, +1.0)},
         {"osd-bar-w", OPT_FLOAT(osd_bar_w), M_RANGE(1, 100)},
         {"osd-bar-h", OPT_FLOAT(osd_bar_h), M_RANGE(0.1, 50)},
+        {"osd-bar-border-size", OPT_FLOAT(osd_bar_border_size), M_RANGE(0, 1000.0)},
         {"osd", OPT_SUBSTRUCT(osd_style, osd_style_conf)},
         {"osd-scale", OPT_FLOAT(osd_scale), M_RANGE(0, 100)},
         {"osd-scale-by-window", OPT_BOOL(osd_scale_by_window)},
@@ -371,6 +372,7 @@ const struct m_sub_options mp_osd_render_sub_opts = {
         .osd_bar_align_y = 0.5,
         .osd_bar_w = 75.0,
         .osd_bar_h = 3.125,
+        .osd_bar_border_size = 1.2,
         .osd_scale = 1,
         .osd_scale_by_window = true,
     },
diff --git a/options/options.h b/options/options.h
index 9f55d5b8b1..28a8c90adb 100644
--- a/options/options.h
+++ b/options/options.h
@@ -135,6 +135,7 @@ struct mp_osd_render_opts {
     float osd_bar_align_y;
     float osd_bar_w;
     float osd_bar_h;
+    float osd_bar_border_size;
     float osd_scale;
     bool osd_scale_by_window;
     struct osd_style_opts *osd_style;
diff --git a/sub/osd_libass.c b/sub/osd_libass.c
index a3b19c96df..d5d317d776 100644
--- a/sub/osd_libass.c
+++ b/sub/osd_libass.c
@@ -378,12 +378,7 @@ static void get_osd_bar_box(struct osd_state *osd, struct osd_object *obj,
     *o_w = track->PlayResX * (opts->osd_bar_w / 100.0);
     *o_h = track->PlayResY * (opts->osd_bar_h / 100.0);
 
-    float base_size = 0.03125;
-    style->Outline *= *o_h / track->PlayResY / base_size;
-    // So that the chapter marks have space between them
-    style->Outline = MPMIN(style->Outline, *o_h / 5.2);
-    // So that the border is not 0
-    style->Outline = MPMAX(style->Outline, *o_h / 32.0);
+    style->Outline = opts->osd_bar_border_size;
     // Rendering with shadow is broken (because there's more than one shape)
     style->Shadow = 0;