diff --git a/changelog/374.fixed.md b/changelog/374.fixed.md
new file mode 100644
index 00000000..0751c038
--- /dev/null
+++ b/changelog/374.fixed.md
@@ -0,0 +1 @@
+Fix branch creation with the sync client while setting `wait_until_completion=False`
\ No newline at end of file
diff --git a/infrahub_sdk/branch.py b/infrahub_sdk/branch.py
index 9d7de1fb..2403e1ef 100644
--- a/infrahub_sdk/branch.py
+++ b/infrahub_sdk/branch.py
@@ -292,13 +292,14 @@ def create(
             },
         }
 
-        query = Mutation(mutation="BranchCreate", input_data=input_data, query=MUTATION_QUERY_DATA)
+        mutation_query = MUTATION_QUERY_TASK if background_execution else MUTATION_QUERY_DATA
+        query = Mutation(mutation="BranchCreate", input_data=input_data, query=mutation_query)
         response = self.client.execute_graphql(query=query.render(), tracker="mutation-branch-create")
 
         # Make sure server version is recent enough to support background execution, as previously
         # using background_execution=True had no effect.
         if background_execution and "task" in response["BranchCreate"]:
-            return BranchData(**response["BranchCreate"]["task"]["id"])
+            return response["BranchCreate"]["task"]["id"]
         return BranchData(**response["BranchCreate"]["object"])
 
     def delete(self, branch_name: str) -> bool: