diff --git a/SAS/OTDB_Services/CMakeLists.txt b/SAS/OTDB_Services/CMakeLists.txt
index 57e85a1cc62315539c1a462cc9a9bc1bbc651c81..074a6020abb012f0a010efcbe202f0e71f76b101 100644
--- a/SAS/OTDB_Services/CMakeLists.txt
+++ b/SAS/OTDB_Services/CMakeLists.txt
@@ -5,6 +5,8 @@ lofar_package(OTDB_Services 1.0 DEPENDS PyMessaging)
 lofar_find_package(Python 3.4 REQUIRED)
 include(PythonInstall)
 
+find_python_module(pg REQUIRED) # sudo aptitude install python3-pg
+
 lofar_add_bin_scripts(
   getOTDBParset
   setOTDBTreeStatus