--- a/mozilla/config.py
+++ b/mozilla/config.py
@@ -2730,17 +2730,17 @@ for platform in BRANCHES['try']['platfor
     # isn't true for try :(
     BRANCHES['try']['platforms'][platform]['stage_product'] = 'firefox'
     # Disable symbol upload across the board
     BRANCHES['try']['platforms'][platform]['upload_symbols'] = False
 
 # Enable mozharness pinning
 for branch in ('ash', 'fx-team', 'try',):
     BRANCHES[branch]['script_repo_manifest'] = \
-        "https://hg.mozilla.org/%(repo_path)s/raw-file/%(revision)s/"
+        "https://hg.mozilla.org/%(repo_path)s/raw-file/%(revision)s/" + \
         "testing/mozharness/mozharness.json"
 
 ######## generic branch configs
 for branch in ACTIVE_PROJECT_BRANCHES:
     branchConfig = PROJECT_BRANCHES[branch]
     BRANCHES[branch]['product_name'] = branchConfig.get('product_name', None)
     BRANCHES[branch]['app_name'] = branchConfig.get('app_name', None)
     BRANCHES[branch]['brand_name'] = branchConfig.get('brand_name', None)