diff --git a/unpacked/jax/output/HTML-CSS/autoload/mtable.js b/unpacked/jax/output/HTML-CSS/autoload/mtable.js
index 6def5d490..0dc813820 100644
--- a/unpacked/jax/output/HTML-CSS/autoload/mtable.js
+++ b/unpacked/jax/output/HTML-CSS/autoload/mtable.js
@@ -214,9 +214,9 @@ MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
         } else {
           //  Get total width minus column spacing
           WW = HTMLCSS.length2em(values.width,mu);
-          for (i = 0, m = Math.min(J+1,CSPACE.length); i < m; i++) {WW -= CSPACE[i]}
+          for (i = 0, m = Math.min(J,CSPACE.length); i < m; i++) {WW -= CSPACE[i]}
           //  Determine individual column widths
-          WW /= J+1;
+          WW /= J;
           for (i = 0, m = Math.min(J+1,CWIDTH.length); i < m; i++) {W[i] = WW}
         }
       } else {
@@ -242,7 +242,7 @@ MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
             if (WP > .98) {Wf = Wp/(Wt+Wp); WW = Wt + Wp} else {WW = Wt / (1-WP)}
           } else {
             WW = HTMLCSS.length2em(values.width,mu);
-            for (i = 0, m = Math.min(J+1,CSPACE.length); i < m; i++) {WW -= CSPACE[i]}
+            for (i = 0, m = Math.min(J,CSPACE.length); i < m; i++) {WW -= CSPACE[i]}
           }
           //  Determine the relative column widths
           for (i = 0, m = P.length; i < m; i++) {