diff --git a/src/houdini_href_e.c b/src/houdini_href_e.c
index 9152803df..8c38d2fb9 100644
--- a/src/houdini_href_e.c
+++ b/src/houdini_href_e.c
@@ -7,7 +7,7 @@
 /*
  * The following characters will not be escaped:
  *
- *		-_.+!*'(),%#@?=;:/,+&$ alphanum
+ *		-_.+!*'(),%#@?=;:/,+&$~ alphanum
  *
  * Note that this character set is the addition of:
  *
@@ -35,7 +35,7 @@ static const char HREF_SAFE[] = {
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
     0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
diff --git a/test/regression.txt b/test/regression.txt
index 0569b3617..87c0107ef 100644
--- a/test/regression.txt
+++ b/test/regression.txt
@@ -169,3 +169,11 @@ This ~text~~~~ is ~~~~curious~.
 .
 <p>This <del>text</del> is <del>curious</del>.</p>
 ````````````````````````````````
+
+`~` should not be escaped in href — https://github.com/github/markup/issues/311
+
+```````````````````````````````` example
+[x](http://members.aon.at/~nkehrer/ibm_5110/emu5110.html)
+.
+<p><a href="http://members.aon.at/~nkehrer/ibm_5110/emu5110.html">x</a></p>
+````````````````````````````````