diff --git a/lib/images/math/precnapprox.xpm b/lib/images/math/precnapprox.xpm
index 704c1480f1..ed4d547223 100644
--- a/lib/images/math/precnapprox.xpm
+++ b/lib/images/math/precnapprox.xpm
@@ -1,7 +1,7 @@
 /* XPM */
 static char *a[] = {
 /* columns rows colors chars-per-pixel */
-"19 37 3 1",
+"19 30 3 1",
 "  c black",
 ". c #5972ff",
 "X c None",
@@ -35,12 +35,5 @@ static char *a[] = {
 "X.XXXXX...XXXXXXXX.",
 ".XXXXX.XXX..XXXXX.X",
 ".XXXXX.XXXXX.....XX",
-".XXXX.XXXXXXXXXXXXX",
-"XXXXXXXXXXXXXXXXXXX",
-"XXXXXXXXXXXXXXXXXXX",
-"XXXXXXXXXXXXXXXXXXX",
-"XXXXXXXXXXXXXXXXXXX",
-"XXXXXXXXXXXXXXXXXXX",
-"XXXXXXXXXXXXXXXXXXX",
-"XXXXXXXXXX.XXXXXXXX"
+".XXXX.XXXXXXXXXXXXX"
 };