diff --git a/CHANGES.txt b/CHANGES.txt
index c0aaa7ac..eba27448 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -4,6 +4,9 @@ Changelog
 3.1.2 - 
 ------------------
 
+- Respect base_url when opening new windows. Fixes #129
+  [ggozad]
+
 - Use gherkin-lint for linting .feature files.
   [ggozad]
 
diff --git a/src/behaving/web/steps/windows.py b/src/behaving/web/steps/windows.py
index 7233c6ce..a7651b77 100644
--- a/src/behaving/web/steps/windows.py
+++ b/src/behaving/web/steps/windows.py
@@ -1,37 +1,40 @@
+from urllib.parse import urljoin
+
 from behave import when
 
 
 def remember_window(context, window, name):
-    """ Associates a name to a Selenium WebDriver
-    window handle to facilitate future lookup. """
+    """Associates a name to a Selenium WebDriver
+    window handle to facilitate future lookup."""
     if not hasattr(context, "name_to_window_"):
         context.name_to_window_ = {}
     context.name_to_window_[name] = window
 
 
 def lookup_window(context, name):
-    """ Finds a Selenium WebDriver window handle by name """
+    """Finds a Selenium WebDriver window handle by name"""
     assert hasattr(context, "name_to_window_"), "No saved windows"
     assert name in context.name_to_window_, f"{name} not found in saved windows"
     return context.name_to_window_[name]
 
 
-@when(u'I name the current window "{name}"')
+@when('I name the current window "{name}"')
 def name_window(context, name):
     current = context.browser.driver.current_window_handle
     remember_window(context, current, name)
 
 
-@when(u'I open a new window named "{name}" at "{url}"')
+@when('I open a new window named "{name}" at "{url}"')
 def open_window(context, name, url):
     driver = context.browser.driver
-    driver.switch_to.new_window('window')
-    driver.get(url)
+    driver.switch_to.new_window("window")
+    full_url = urljoin(context.base_url, url)
+    driver.get(full_url)
     handle = driver.window_handles[-1]
     remember_window(context, handle, name)
 
 
-@when(u'I switch to the window named "{name}"')
+@when('I switch to the window named "{name}"')
 def switch_window(context, name):
     """
     Changes the window Selenium executes subsequent commands on.
diff --git a/tests/features/windows.feature b/tests/features/windows.feature
index eca99d0d..c5fb99eb 100644
--- a/tests/features/windows.feature
+++ b/tests/features/windows.feature
@@ -25,3 +25,11 @@ Feature: Windows
         When I switch to the window named "window1"
         Then I should see "I'm window 1"
         But I should not see "I'm window 2"
+
+    Scenario: It can open a new window with relative urls when base_url is set.
+        Given a browser
+        Given the base url "http://web"
+        When I open a new window named "window1" at "/window1.html"
+        Then I should see "I'm window 1"
+        When I open a new window named "window2" at "http://web/window2.html"
+        Then I should see "I'm window 2"