diff --git a/django/views/debug.py b/django/views/debug.py
index bde60ee58e..e5baf91662 100644
--- a/django/views/debug.py
+++ b/django/views/debug.py
@@ -349,11 +349,11 @@ TECHNICAL_500_TEMPLATE = """
         {% if frame.context_line %}
           <div class="context" id="c{{ frame.id }}">
             {% if frame.pre_context %}
-              <ol start="{{ frame.pre_context_lineno }}" class="pre-context" id="pre{{ frame.id }}">{% for line in frame.pre_context %}<li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')">{{ line|escape }}</li>{% endfor %}</ol>
+              <ol start="{{ frame.pre_context_lineno|add:"1" }}" class="pre-context" id="pre{{ frame.id }}">{% for line in frame.pre_context %}<li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')">{{ line|escape }}</li>{% endfor %}</ol>
             {% endif %}
-            <ol start="{{ frame.lineno }}" class="context-line"><li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')">{{ frame.context_line|escape }} <span>...</span></li></ol>
+            <ol start="{{ frame.lineno|add:"1" }}" class="context-line"><li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')">{{ frame.context_line|escape }} <span>...</span></li></ol>
             {% if frame.post_context %}
-              <ol start='{{ frame.lineno|add:"1" }}' class="post-context" id="post{{ frame.id }}">{% for line in frame.post_context %}<li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')">{{ line|escape }}</li>{% endfor %}</ol>
+              <ol start='{{ frame.lineno|add:"2" }}' class="post-context" id="post{{ frame.id }}">{% for line in frame.post_context %}<li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')">{{ line|escape }}</li>{% endfor %}</ol>
             {% endif %}
           </div>
         {% endif %}