diff --git a/openbox/client.c b/openbox/client.c
index fe342f65..efb815e7 100644
--- a/openbox/client.c
+++ b/openbox/client.c
@@ -1826,7 +1826,8 @@ void client_setup_decor_and_functions(ObClient *self, gboolean reconfig)
     /* finally, the user can have requested no decorations, which overrides
        everything (but doesnt give it a border if it doesnt have one) */
     if (self->undecorated)
-        self->decorations = 0;
+        self->decorations &= (config_theme_keepborder ?
+                              OB_FRAME_DECOR_BORDER : 0);
 
     /* if we don't have a titlebar, then we cannot shade! */
     if (!(self->decorations & OB_FRAME_DECOR_TITLEBAR))
diff --git a/openbox/frame.c b/openbox/frame.c
index e4a64bd3..c1b31570 100644
--- a/openbox/frame.c
+++ b/openbox/frame.c
@@ -340,14 +340,14 @@ void frame_adjust_area(ObFrame *self, gboolean moved,
         self->max_vert = self->client->max_vert;
         self->shaded = self->client->shaded;
 
-        if (self->decorations & OB_FRAME_DECOR_BORDER ||
-            (self->client->undecorated && config_theme_keepborder
-             && !self->client->fullscreen))
+        if (self->decorations & OB_FRAME_DECOR_BORDER)
             self->bwidth = ob_rr_theme->fbwidth;
         else
             self->bwidth = 0;
 
-        if (self->decorations & OB_FRAME_DECOR_BORDER) {
+        if (self->decorations & OB_FRAME_DECOR_BORDER &&
+            !self->client->undecorated)
+        {
             self->cbwidth_l = self->cbwidth_r = ob_rr_theme->cbwidthx;
             self->cbwidth_t = self->cbwidth_b = ob_rr_theme->cbwidthy;
         } else
@@ -371,8 +371,7 @@ void frame_adjust_area(ObFrame *self, gboolean moved,
         STRUT_SET(self->size,
                   self->cbwidth_l + (!self->max_horz ? self->bwidth : 0),
                   self->cbwidth_t +
-                  (!self->max_horz || !self->max_vert ||
-                   !self->client->undecorated ? self->bwidth : 0),
+                  (!self->max_horz || !self->max_vert ? self->bwidth : 0),
                   self->cbwidth_r + (!self->max_horz ? self->bwidth : 0),
                   self->cbwidth_b +
                   (!self->max_horz || !self->max_vert ? self->bwidth : 0));