diff --git a/bijoe/engine.py b/bijoe/engine.py
index fe0d89f..c6f162f 100644
--- a/bijoe/engine.py
+++ b/bijoe/engine.py
@@ -116,7 +116,7 @@ psycopg2.extensions.register_type(POINT_ARRAY)
 
 
 def to_tuple(cur, values):
-    return cur.mogrify(', '.join(['%s'] * len(values)), values)
+    return force_text(cur.mogrify(', '.join(['%s'] * len(values)), values))
 
 
 Member = collections.namedtuple('Member', ['id', 'label'])
@@ -166,7 +166,7 @@ class EngineDimension(object):
             if not condition:
                 continue
             with self.engine.get_cursor() as cursor:  # Ugly...
-                condition = cursor.mogrify(condition, values)
+                condition = force_text(cursor.mogrify(condition, values))
             if dimension.filter_needs_join and dimension.join:
                 joins.update(dimension.join)
             conditions.append(condition)
@@ -383,7 +383,7 @@ class EngineCube(object):
                 condition, values = dimension.build_filter(values)
                 if not condition:
                     continue
-                condition = cursor.mogrify(condition, values)
+                condition = force_text(cursor.mogrify(condition, values))
                 if dimension.filter_needs_join and dimension.join:
                     joins.update(dimension.join)
                 if dimension.filter_in_join: