diff --git a/app/db_mgr.py b/app/db_mgr.py
index 51e1c1d..eaa0c34 100644
--- a/app/db_mgr.py
+++ b/app/db_mgr.py
@@ -86,7 +86,7 @@ def charges_by_project_stacked(project_id, category="service"):
             sem_n, value_n0, value_n1, ....., value_nn,
     """
     if category == 'capacity':
-        category_table = 'service'
+        category_table = 'capacity'
         sql_req = """
         select c.charge_rate
         from capacity c1 left join
@@ -94,7 +94,7 @@ def charges_by_project_stacked(project_id, category="service"):
         order by c1.id
         """
     elif category == 'service':
-        category_table = 'capacity'
+        category_table = 'service'
         sql_req = """
         select c.charge_rate
         from service s left join
@@ -103,7 +103,7 @@ def charges_by_project_stacked(project_id, category="service"):
         """
     else:
         raise ValueError("Waiting for 'service' or 'capacity'")
-    categories_req = "select name from {} order by id".format(category)
+    categories_req = "select name from {} order by id".format(category_table)
     categories = [c for (c,) in db.session.execute(categories_req)]
     headers = ['period']+categories
     all_charges = [headers]
--
libgit2 0.21.2