diff --git a/lib/sax.js b/lib/sax.js
index 795d607e..53999e6c 100644
--- a/lib/sax.js
+++ b/lib/sax.js
@@ -1263,6 +1263,8 @@
             })
             parser.procInstName = parser.procInstBody = ''
             parser.state = S.TEXT
+          } else if (c === '?') {
+            parser.procInstBody += '?'
           } else {
             parser.procInstBody += '?' + c
             parser.state = S.PROC_INST_BODY
diff --git a/test/issue-233.js b/test/issue-233.js
new file mode 100644
index 00000000..c93d3b37
--- /dev/null
+++ b/test/issue-233.js
@@ -0,0 +1,10 @@
+require(__dirname).test({
+  xml: '<r><?Is this legal XML??><?Is this legal XML? ?></r>',
+  expect: [
+    ['opentagstart', {'name': 'R', 'attributes': {}}],
+    ['opentag', {'name': 'R', 'attributes': {}, 'isSelfClosing': false}],
+    [ 'processinginstruction', { name: 'Is', body: 'this legal XML?' } ],
+    [ 'processinginstruction', { name: 'Is', body: 'this legal XML? ' } ],
+    ['closetag', 'R']
+  ]
+})