diff --git a/wa/framework/configuration/core.py b/wa/framework/configuration/core.py
index 93db1b53..f5111fde 100644
--- a/wa/framework/configuration/core.py
+++ b/wa/framework/configuration/core.py
@@ -869,7 +869,7 @@ class JobSpec(Configuration):
         self.runtime_parameters = target_manager.merge_runtime_parameters(runtime_parameters)
 
     def finalize(self):
-        self.id = "-".join([source.config['id']
+        self.id = "-".join([str(source.config['id'])
                             for source in self._sources[1:]])  # ignore first id, "global"
 
         # ensure *_parameters are always obj_dict's
diff --git a/wa/framework/configuration/parsers.py b/wa/framework/configuration/parsers.py
index de45611d..3ed801b8 100644
--- a/wa/framework/configuration/parsers.py
+++ b/wa/framework/configuration/parsers.py
@@ -322,6 +322,7 @@ def _construct_valid_entry(raw, seen_ids, prefix, jobs_config):
 def _collect_valid_id(entry_id, seen_ids, entry_type):
     if entry_id is None:
         return
+    entry_id = str(entry_id)
     if entry_id in seen_ids:
         raise ConfigError('Duplicate {} ID "{}".'.format(entry_type, entry_id))
     # "-" is reserved for joining section and workload IDs