diff --git a/datasette/app.py b/datasette/app.py
index 20aae7d0..353e4a10 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -1204,7 +1204,7 @@ def route_pattern_from_filepath(filepath):
             re_bits.append("(?P<{}>[^/]*)".format(bit[1:-1]))
         else:
             re_bits.append(re.escape(bit))
-    return re.compile("".join(re_bits))
+    return re.compile("^" + "".join(re_bits) + "$")
 
 
 class NotFoundExplicit(NotFound):
diff --git a/tests/test_custom_pages.py b/tests/test_custom_pages.py
index f6180c16..071b055b 100644
--- a/tests/test_custom_pages.py
+++ b/tests/test_custom_pages.py
@@ -64,10 +64,15 @@ def test_redirect2(custom_pages_client):
     assert "/example" == response.headers["Location"]
 
 
-def test_custom_route_pattern(custom_pages_client):
-    response = custom_pages_client.get("/route_Sally")
+@pytest.mark.parametrize("path,expected", [
+    ("/route_Sally", "<p>Hello from Sally</p>"),
+    ("/topic_python", "Topic page for python"),
+    ("/topic_python/info", "Slug: info, Topic: python"),
+])
+def test_custom_route_pattern(custom_pages_client, path, expected):
+    response = custom_pages_client.get(path)
     assert response.status == 200
-    assert response.text.strip() == "<p>Hello from Sally</p>"
+    assert response.text.strip() == expected
 
 
 def test_custom_route_pattern_404(custom_pages_client):
diff --git a/tests/test_templates/pages/topic_{topic}.html b/tests/test_templates/pages/topic_{topic}.html
new file mode 100644
index 00000000..f07b6b07
--- /dev/null
+++ b/tests/test_templates/pages/topic_{topic}.html
@@ -0,0 +1 @@
+Topic page for {{ topic }}
\ No newline at end of file
diff --git a/tests/test_templates/pages/topic_{topic}/{slug}.html b/tests/test_templates/pages/topic_{topic}/{slug}.html
new file mode 100644
index 00000000..cbe5344f
--- /dev/null
+++ b/tests/test_templates/pages/topic_{topic}/{slug}.html
@@ -0,0 +1 @@
+Slug: {{ slug }}, Topic: {{ topic }}
\ No newline at end of file