diff --git a/ros_buildfarm/config/build_file.py b/ros_buildfarm/config/build_file.py
index 61f2c34c2..cc7fd1371 100644
--- a/ros_buildfarm/config/build_file.py
+++ b/ros_buildfarm/config/build_file.py
@@ -63,9 +63,13 @@ def __init__(self, name, data):  # noqa: D107
             assert isinstance(self.tag_blacklist, list)
 
         self.targets = {}
+        self.custom_rosdep_urls = []
         for os_name in data.get('targets', {}).keys():
             if os_name == '_config':
-                continue
+                if 'custom_rosdep_urls' in data['targets']['_config']:
+                    self.custom_rosdep_urls = \
+                        data['targets']['_config']['custom_rosdep_urls']
+                    assert isinstance(self.custom_rosdep_urls, list)
             self.targets[os_name] = {}
             for os_code_name in data['targets'][os_name].keys():
                 self.targets[os_name][os_code_name] = {}
@@ -73,13 +77,6 @@ def __init__(self, name, data):  # noqa: D107
                     self.targets[os_name][os_code_name][arch] = \
                         data['targets'][os_name][os_code_name][arch]
 
-        self.custom_rosdep_urls = []
-        if '_config' in data['targets']:
-            if 'custom_rosdep_urls' in data['targets']['_config']:
-                self.custom_rosdep_urls = \
-                    data['targets']['_config']['custom_rosdep_urls']
-                assert isinstance(self.custom_rosdep_urls, list)
-
         self.shared_ccache = False
         if 'shared_ccache' in data:
             self.shared_ccache = bool(data['shared_ccache'])