diff --git a/src/fl_plastic.cxx b/src/fl_plastic.cxx
index 75b0bbc5f..a3c1cbe1f 100644
--- a/src/fl_plastic.cxx
+++ b/src/fl_plastic.cxx
@@ -265,8 +265,11 @@ static void thin_up_box(int x, int y, int w, int h, Fl_Color c) {
 
 
 static void up_round(int x, int y, int w, int h, Fl_Color c) {
-  shade_round(x + 1, y + 1, w - 2, h - 3, "RVQNOPQRSTUVWVQ", c);
-  frame_round(x, y, w, h - 1, "IJLM", c);
+  if (w != h) up_box(x, y, w, h, c);
+  else {
+    shade_round(x + 1, y + 1, w - 2, h - 3, "RVQNOPQRSTUVWVQ", c);
+    frame_round(x, y, w, h - 1, "IJLM", c);
+  }
 }
 
 
@@ -282,8 +285,11 @@ static void down_box(int x, int y, int w, int h, Fl_Color c) {
 
 
 static void down_round(int x, int y, int w, int h, Fl_Color c) {
-  shade_round(x + 2, y + 2, w - 4, h - 5, "STUVWWWVT", c);
-  frame_round(x, y, w, h - 1, "MLJI", c);
+  if (w != h) down_box(x, y, w, h, c);
+  else {
+    shade_round(x + 2, y + 2, w - 4, h - 5, "STUVWWWVT", c);
+    frame_round(x, y, w, h - 1, "MLJI", c);
+  }
 }