diff --git a/common/database_helpers.py b/common/database_helpers.py
index 1873fc6c..be1e745e 100644
--- a/common/database_helpers.py
+++ b/common/database_helpers.py
@@ -467,8 +467,8 @@ def __init__(self, instrument_id):
         investigationInstrument = aliased(INSTRUMENT)
         self.base_query = self.base_query\
             .join(FACILITYCYCLE.FACILITY) \
-            .join(FACILITY.INSTRUMENTS) \
-            .join(FACILITY.INVESTIGATIONS) \
+            .join(FACILITY.INSTRUMENT) \
+            .join(FACILITY.INVESTIGATION) \
             .join(INVESTIGATION.INVESTIGATIONINSTRUMENT) \
             .join(investigationInstrument, INVESTIGATIONINSTRUMENT.INSTRUMENT) \
             .filter(INSTRUMENT.ID == instrument_id) \