diff --git a/.github/workflows/installcheck.yml b/.github/workflows/installcheck.yml
index 71d2c09..aa35197 100644
--- a/.github/workflows/installcheck.yml
+++ b/.github/workflows/installcheck.yml
@@ -19,8 +19,6 @@ jobs:
           - 17
           - 16
           - 15
-          - 14
-          - 13
 
     env:
       PGVERSION: ${{ matrix.pgversion }}
diff --git a/pg_show_plans.c b/pg_show_plans.c
index d591ef9..f41f998 100644
--- a/pg_show_plans.c
+++ b/pg_show_plans.c
@@ -159,7 +159,11 @@ _PG_init(void)
 	                         NULL,
 	                         &start_enabled,
 	                         true,
+#if PG_VERSION_NUM >= 150000
 	                         PGC_USERSET,
+#else
+	                         PGC_POSTMASTER,
+#endif
 	                         0,
 	                         NULL, set_state, show_state);
 	DefineCustomIntVariable("pg_show_plans.max_plan_length",
@@ -183,7 +187,11 @@ _PG_init(void)
 	                         &plan_format,
 	                         EXPLAIN_FORMAT_TEXT,
 	                         plan_formats,
+#if PG_VERSION_NUM >= 150000
 	                         PGC_USERSET,
+#else
+	                         PGC_POSTMASTER,
+#endif
 	                         0,
 	                         NULL, prop_format_to_shmem, show_format);