diff --git a/collector.c b/collector.c
index 235d95f..a59083f 100644
--- a/collector.c
+++ b/collector.c
@@ -348,7 +348,7 @@ pgws_collector_main(Datum main_arg)
 	pqsignal(SIGTERM, handle_sigterm);
 	pqsignal(SIGUSR1, procsignal_sigusr1_handler);
 	BackgroundWorkerUnblockSignals();
-	InitPostgresCompat(NULL, InvalidOid, NULL, InvalidOid, false, false, NULL);
+	InitPostgresCompat(NULL, InvalidOid, NULL, InvalidOid, 0, NULL);
 	SetProcessingMode(NormalProcessing);
 
 	/* Make pg_wait_sampling recognisable in pg_stat_activity */
diff --git a/compat.h b/compat.h
index 72a63ab..e515765 100644
--- a/compat.h
+++ b/compat.h
@@ -28,22 +28,26 @@ shm_mq_send_compat(shm_mq_handle *mqh, Size nbytes, const void *data,
 #endif
 }
 
+#if PG_VERSION_NUM < 170000
+#define INIT_PG_LOAD_SESSION_LIBS		0x0001
+#define INIT_PG_OVERRIDE_ALLOW_CONNS	0x0002
+#endif
+
 static inline void
 InitPostgresCompat(const char *in_dbname, Oid dboid,
 				   const char *username, Oid useroid,
-				   bool load_session_libraries,
-				   bool override_allow_connections,
+				   bits32 flags,
 				   char *out_dbname)
 {
 #if PG_VERSION_NUM >= 170000
-	InitPostgres(in_dbname, dboid, username, useroid, (load_session_libraries ? INIT_PG_LOAD_SESSION_LIBS : 0) |
-				 (override_allow_connections ? INIT_PG_OVERRIDE_ALLOW_CONNS : 0), out_dbname);
+	InitPostgres(in_dbname, dboid, username, useroid, flags, out_dbname);
 #elif PG_VERSION_NUM >= 150000
-	InitPostgres(in_dbname, dboid, username, useroid, load_session_libraries,
-				 override_allow_connections, out_dbname);
+	InitPostgres(in_dbname, dboid, username, useroid,
+				 flags & INIT_PG_LOAD_SESSION_LIBS,
+				 flags & INIT_PG_OVERRIDE_ALLOW_CONNS, out_dbname);
 #else
 	InitPostgres(in_dbname, dboid, username, useroid, out_dbname,
-				 override_allow_connections);
+				 flags & INIT_PG_OVERRIDE_ALLOW_CONNS);
 #endif
 }