diff --git a/src/markup/engine/__tests__/remarkup/percent-block-solo.txt b/src/markup/engine/__tests__/remarkup/percent-block-solo.txt
new file mode 100644
--- /dev/null
+++ b/src/markup/engine/__tests__/remarkup/percent-block-solo.txt
@@ -0,0 +1,8 @@
+%%%
+**x**%%%
+~~~~~~~~~~
+<p class="remarkup-literal">
+<br />**x**</p>
+~~~~~~~~~~
+
+**x**
diff --git a/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php b/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php
--- a/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php
+++ b/src/markup/engine/remarkup/blockrule/PhutilRemarkupLiteralBlockRule.php
@@ -26,6 +26,13 @@
     while (preg_match('/^\s*%%%/', $lines[$cursor])) {
       $num_lines++;
 
+      // If the line has ONLY "%%%", the block opener doesn't get to double
+      // up as a block terminator.
+      if (preg_match('/^\s*%%%\s*\z/', $lines[$cursor])) {
+        $num_lines++;
+        $cursor++;
+      }
+
       while (isset($lines[$cursor])) {
         if (!preg_match('/%%%\s*$/', $lines[$cursor])) {
           $num_lines++;