diff --git a/source/blender/imbuf/IMB_thumbs.h b/source/blender/imbuf/IMB_thumbs.h
index a013e7e38dd..9dd0cbe895f 100644
--- a/source/blender/imbuf/IMB_thumbs.h
+++ b/source/blender/imbuf/IMB_thumbs.h
@@ -80,7 +80,6 @@ void IMB_thumb_makedirs(void);
 struct ImBuf *IMB_thumb_load_blend(const char *blen_path,
                                    const char *blen_group,
                                    const char *blen_id);
-void IMB_thumb_overlay_blend(unsigned int *thumb, int width, int height, float aspect);
 
 /* special function for previewing fonts */
 struct ImBuf *IMB_thumb_load_font(const char *filename, unsigned int x, unsigned int y);
diff --git a/source/blender/imbuf/intern/thumbs_blend.c b/source/blender/imbuf/intern/thumbs_blend.c
index 0d1fa354b3e..106e4618847 100644
--- a/source/blender/imbuf/intern/thumbs_blend.c
+++ b/source/blender/imbuf/intern/thumbs_blend.c
@@ -100,61 +100,3 @@ ImBuf *IMB_thumb_load_blend(const char *blen_path, const char *blen_group, const
 
   return ima;
 }
-
-/* add a fake passepartout overlay to a byte buffer, use for blend file thumbnails */
-#define MARGIN 2
-
-void IMB_thumb_overlay_blend(unsigned int *thumb, int width, int height, float aspect)
-{
-  unsigned char *px = (unsigned char *)thumb;
-  int margin_l = MARGIN;
-  int margin_b = MARGIN;
-  int margin_r = width - MARGIN;
-  int margin_t = height - MARGIN;
-
-  if (aspect < 1.0f) {
-    margin_l = (int)((width - ((float)width * aspect)) / 2.0f);
-    margin_l += MARGIN;
-    CLAMP(margin_l, MARGIN, (width / 2));
-    margin_r = width - margin_l;
-  }
-  else if (aspect > 1.0f) {
-    margin_b = (int)((height - ((float)height / aspect)) / 2.0f);
-    margin_b += MARGIN;
-    CLAMP(margin_b, MARGIN, (height / 2));
-    margin_t = height - margin_b;
-  }
-
-  {
-    int x, y;
-    int stride_x = (margin_r - margin_l) - 2;
-
-    for (y = 0; y < height; y++) {
-      for (x = 0; x < width; x++, px += 4) {
-        int hline = 0, vline = 0;
-        if ((x > margin_l && x < margin_r) && (y > margin_b && y < margin_t)) {
-          /* interior. skip */
-          x += stride_x;
-          px += stride_x * 4;
-        }
-        else if ((hline = (((x == margin_l || x == margin_r)) && y >= margin_b &&
-                           y <= margin_t)) ||
-                 (vline = (((y == margin_b || y == margin_t)) && x >= margin_l &&
-                           x <= margin_r))) {
-          /* dashed line */
-          if ((hline && y % 2) || (vline && x % 2)) {
-            px[0] = px[1] = px[2] = 0;
-            px[3] = 255;
-          }
-        }
-        else {
-          /* outside, fill in alpha, like passepartout */
-          px[0] *= 0.5f;
-          px[1] *= 0.5f;
-          px[2] *= 0.5f;
-          px[3] = (px[3] * 0.5f) + 96;
-        }
-      }
-    }
-  }
-}
diff --git a/source/blender/windowmanager/intern/wm_files.c b/source/blender/windowmanager/intern/wm_files.c
index 8bea2203abe..d2d080a9a68 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -1398,14 +1398,8 @@ static ImBuf *blend_file_thumb(const bContext *C,
   }
 
   if (ibuf) {
-    float aspect = (scene->r.xsch * scene->r.xasp) / (scene->r.ysch * scene->r.yasp);
-
     /* dirty oversampling */
     IMB_scaleImBuf(ibuf, BLEN_THUMB_SIZE, BLEN_THUMB_SIZE);
-
-    /* add pretty overlay */
-    IMB_thumb_overlay_blend(ibuf->rect, ibuf->x, ibuf->y, aspect);
-
     thumb = BKE_main_thumbnail_from_imbuf(NULL, ibuf);
   }
   else {