diff --git a/runtime/env-defaults b/runtime/env-defaults
new file mode 100644
index 0000000..4b1eb4c
--- /dev/null
+++ b/runtime/env-defaults
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+PG_SSL=${PG_SSL:-}
+
+PG_TRUST_LOCALNET=${PG_TRUST_LOCALNET:-$PSQL_TRUST_LOCALNET} # backward compatibility
+PG_TRUST_LOCALNET=${PG_TRUST_LOCALNET:-false}
+
+REPLICATION_MODE=${REPLICATION_MODE:-$PSQL_MODE} # backward compatibility
+REPLICATION_MODE=${REPLICATION_MODE:-}
+REPLICATION_USER=${REPLICATION_USER:-}
+REPLICATION_PASS=${REPLICATION_PASS:-}
+REPLICATION_HOST=${REPLICATION_HOST:-}
+REPLICATION_PORT=${REPLICATION_PORT:-}
+REPLICATION_SSLMODE=${REPLICATION_SSLMODE:-}
+
+DB_NAME=${DB_NAME:-}
+DB_USER=${DB_USER:-}
+DB_PASS=${DB_PASS:-}
+
+DB_LOCALE=${DB_LOCALE:-C}
+DB_UNACCENT=${DB_UNACCENT:-false}
diff --git a/runtime/functions b/runtime/functions
index bc79fd1..ced1a2f 100755
--- a/runtime/functions
+++ b/runtime/functions
@@ -1,25 +1,6 @@
 #!/bin/bash
 set -e
-
-PG_SSL=${PG_SSL:-}
-
-PG_TRUST_LOCALNET=${PG_TRUST_LOCALNET:-$PSQL_TRUST_LOCALNET} # backward compatibility
-PG_TRUST_LOCALNET=${PG_TRUST_LOCALNET:-false}
-
-REPLICATION_MODE=${REPLICATION_MODE:-$PSQL_MODE} # backward compatibility
-REPLICATION_MODE=${REPLICATION_MODE:-}
-REPLICATION_USER=${REPLICATION_USER:-}
-REPLICATION_PASS=${REPLICATION_PASS:-}
-REPLICATION_HOST=${REPLICATION_HOST:-}
-REPLICATION_PORT=${REPLICATION_PORT:-}
-REPLICATION_SSLMODE=${REPLICATION_SSLMODE:-}
-
-DB_NAME=${DB_NAME:-}
-DB_USER=${DB_USER:-}
-DB_PASS=${DB_PASS:-}
-
-DB_LOCALE=${DB_LOCALE:-C}
-DB_UNACCENT=${DB_UNACCENT:-false}
+source ${PG_APP_HOME}/env-defaults
 
 PG_CONF=${PG_DATADIR}/postgresql.conf
 PG_HBA_CONF=${PG_DATADIR}/pg_hba.conf