diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -119,7 +119,7 @@
     'rsrc/css/font/font-lato.css' => 'c7ccd872',
     'rsrc/css/font/phui-font-icon-base.css' => '870a7360',
     'rsrc/css/layout/phabricator-filetree-view.css' => 'b912ad97',
-    'rsrc/css/layout/phabricator-source-code-view.css' => 'c5edc888',
+    'rsrc/css/layout/phabricator-source-code-view.css' => '09368218',
     'rsrc/css/phui/button/phui-button-bar.css' => 'f1ff5494',
     'rsrc/css/phui/button/phui-button-simple.css' => '8e1baf68',
     'rsrc/css/phui/button/phui-button.css' => '1863cc6e',
@@ -471,7 +471,7 @@
     'rsrc/js/core/behavior-keyboard-pager.js' => 'a8da01f0',
     'rsrc/js/core/behavior-keyboard-shortcuts.js' => '01fca1f0',
     'rsrc/js/core/behavior-lightbox-attachments.js' => '6b31879a',
-    'rsrc/js/core/behavior-line-linker.js' => '69837bed',
+    'rsrc/js/core/behavior-line-linker.js' => '36165eb1',
     'rsrc/js/core/behavior-more.js' => 'a80d0378',
     'rsrc/js/core/behavior-object-selector.js' => '77c1f0b0',
     'rsrc/js/core/behavior-oncopy.js' => '2926fff2',
@@ -634,7 +634,7 @@
     'javelin-behavior-phabricator-gesture-example' => '558829c2',
     'javelin-behavior-phabricator-keyboard-pager' => 'a8da01f0',
     'javelin-behavior-phabricator-keyboard-shortcuts' => '01fca1f0',
-    'javelin-behavior-phabricator-line-linker' => '69837bed',
+    'javelin-behavior-phabricator-line-linker' => '36165eb1',
     'javelin-behavior-phabricator-nav' => '94b7c320',
     'javelin-behavior-phabricator-notification-example' => '8ce821c5',
     'javelin-behavior-phabricator-object-selector' => '77c1f0b0',
@@ -780,7 +780,7 @@
     'phabricator-search-results-css' => '505dd8cf',
     'phabricator-shaped-request' => '7cbe244b',
     'phabricator-slowvote-css' => 'a94b7230',
-    'phabricator-source-code-view-css' => 'c5edc888',
+    'phabricator-source-code-view-css' => '09368218',
     'phabricator-standard-page-view' => '34ee718b',
     'phabricator-textareautils' => '320810c8',
     'phabricator-title' => '485aaa6c',
@@ -1098,6 +1098,12 @@
       'javelin-dom',
       'javelin-vector',
     ),
+    '36165eb1' => array(
+      'javelin-behavior',
+      'javelin-stratcom',
+      'javelin-dom',
+      'javelin-history',
+    ),
     '3ab51e2c' => array(
       'javelin-behavior',
       'javelin-behavior-device',
@@ -1407,12 +1413,6 @@
       'javelin-dom',
       'phuix-button-view',
     ),
-    '69837bed' => array(
-      'javelin-behavior',
-      'javelin-stratcom',
-      'javelin-dom',
-      'javelin-history',
-    ),
     '69adf288' => array(
       'javelin-install',
     ),
diff --git a/src/view/layout/PhabricatorSourceCodeView.php b/src/view/layout/PhabricatorSourceCodeView.php
--- a/src/view/layout/PhabricatorSourceCodeView.php
+++ b/src/view/layout/PhabricatorSourceCodeView.php
@@ -66,7 +66,6 @@
     require_celerity_resource('phabricator-source-code-view-css');
     require_celerity_resource('syntax-highlighting-css');
 
-    Javelin::initBehavior('phabricator-oncopy', array());
     if ($this->canClickHighlight) {
       Javelin::initBehavior('phabricator-line-linker');
     }
@@ -78,11 +77,11 @@
     $lines = $this->lines;
     if ($this->truncatedFirstLines) {
       $lines[] = phutil_tag(
-          'span',
-          array(
-            'class' => 'c',
-          ),
-          pht('...'));
+        'span',
+        array(
+          'class' => 'c',
+        ),
+        pht('...'));
     } else if ($this->truncatedFirstBytes) {
       $last_key = last_key($lines);
       $lines[$last_key] = hsprintf(
@@ -98,9 +97,6 @@
 
     $base_uri = (string)$this->uri;
     foreach ($lines as $line) {
-      // NOTE: See phabricator-oncopy behavior.
-      $content_line = hsprintf("\xE2\x80\x8B%s", $line);
-
       $row_attributes = array();
       if (isset($this->highlights[$line_number])) {
         $row_attributes['class'] = 'phabricator-source-highlight';
@@ -117,8 +113,8 @@
           'a',
           array(
             'href' => $line_href,
-          ),
-          $line_number);
+            'data-n' => $line_number,
+          ));
       } else {
         $tag_number = phutil_tag(
           'span',
@@ -172,7 +168,7 @@
             array(
               'class' => 'phabricator-source-code',
             ),
-            $content_line),
+            $line),
           ));
 
       $line_number++;
diff --git a/webroot/rsrc/css/layout/phabricator-source-code-view.css b/webroot/rsrc/css/layout/phabricator-source-code-view.css
--- a/webroot/rsrc/css/layout/phabricator-source-code-view.css
+++ b/webroot/rsrc/css/layout/phabricator-source-code-view.css
@@ -25,16 +25,11 @@
   text-align: right;
   border-right: 1px solid {$paste.border};
   color: {$sh-yellowtext};
+}
 
-  /* When the user selects rows of source, don't visibly select the line
-     numbers beside them. We use JS to strip the line numbers out when the user
-     copies the text. */
-  -moz-user-select: -moz-none;
-  -khtml-user-select: none;
-  -webkit-user-select: none;
-  -ms-user-select: none;
-  user-select: none;
-  white-space: nowrap;
+.phabricator-source-line > a::before {
+  /* Render the line numbers as a pseudo-element so they don't get copied. */
+  content: attr(data-n);
 }
 
 th.phabricator-source-line a,
diff --git a/webroot/rsrc/js/core/behavior-line-linker.js b/webroot/rsrc/js/core/behavior-line-linker.js
--- a/webroot/rsrc/js/core/behavior-line-linker.js
+++ b/webroot/rsrc/js/core/behavior-line-linker.js
@@ -29,7 +29,7 @@
       }
     }
 
-    return +(th.textContent || th.innerText);
+    return null;
   }
 
   JX.Stratcom.listen(