diff --git a/.expeditor/config.yml b/.expeditor/config.yml
index 879e042..7b64334 100644
--- a/.expeditor/config.yml
+++ b/.expeditor/config.yml
@@ -23,7 +23,7 @@ pipelines:
       env:
         - ADHOC: true
         - IGNORE_CACHE: true
-        - OMNIBUS_USE_INTERNAL_SOURCES: true
+        - OMNIBUS_USE_INTERNAL_SOURCES: false
   - omnibus/adhoc-canary:
       canary: true
       definition: .expeditor/adhoc-canary.omnibus.yml
diff --git a/omnibus.rb b/omnibus.rb
index 1d20763..0cbd9b0 100644
--- a/omnibus.rb
+++ b/omnibus.rb
@@ -32,7 +32,7 @@
 windows_arch env_omnibus_windows_arch
 
 use_git_caching true
-use_internal_sources ENV.fetch("OMNIBUS_USE_INTERNAL_SOURCES", true)
+use_internal_sources ENV.fetch("OMNIBUS_USE_INTERNAL_SOURCES", false)
 
 # Enable S3 asset caching
 # ------------------------------