diff --git a/src/katex.less b/src/katex.less
index 62bd398e..f262be41 100644
--- a/src/katex.less
+++ b/src/katex.less
@@ -13,7 +13,8 @@
         .overline .overline-line,
         .underline .underline-line,
         .hline,
-        .hdashline {
+        .hdashline,
+        .rule {
             min-height: 1px;
         }
     }
diff --git a/test/screenshotter/images/LargeRuleNumerator-chrome.png b/test/screenshotter/images/LargeRuleNumerator-chrome.png
index d61a2785..398741fe 100644
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diff --git a/test/screenshotter/images/LargeRuleNumerator-firefox.png b/test/screenshotter/images/LargeRuleNumerator-firefox.png
index e3fa7371..4c7fea20 100644
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diff --git a/test/screenshotter/images/LeftRightStyleSizing-chrome.png b/test/screenshotter/images/LeftRightStyleSizing-chrome.png
index 2dc04446..334b820e 100644
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diff --git a/test/screenshotter/images/LeftRightStyleSizing-firefox.png b/test/screenshotter/images/LeftRightStyleSizing-firefox.png
index 2b7b5afc..acca4f67 100644
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diff --git a/test/screenshotter/images/RelativeUnits-chrome.png b/test/screenshotter/images/RelativeUnits-chrome.png
index ae13c423..8d5e35db 100644
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diff --git a/test/screenshotter/images/RelativeUnits-firefox.png b/test/screenshotter/images/RelativeUnits-firefox.png
index d1435593..273e4677 100644
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diff --git a/test/screenshotter/images/Rule-chrome.png b/test/screenshotter/images/Rule-chrome.png
index 0fcfa441..14576fd2 100644
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diff --git a/test/screenshotter/images/Rule-firefox.png b/test/screenshotter/images/Rule-firefox.png
index 0fcfa441..14576fd2 100644
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