diff --git a/src/bin/initdb/initdb.c b/src/bin/initdb/initdb.c
index 5036d01b608..874775577a4 100644
--- a/src/bin/initdb/initdb.c
+++ b/src/bin/initdb/initdb.c
@@ -1359,7 +1359,7 @@ setup_config(void)
 	autoconflines[1] = pg_strdup("# It will be overwritten by the ALTER SYSTEM command.\n");
 	autoconflines[2] = NULL;
 
-	sprintf(path, "%s/%s", pg_data, PG_AUTOCONF_FILENAME);
+	sprintf(path, "%s/postgresql.auto.conf", pg_data);
 
 	writefile(path, autoconflines);
 	if (chmod(path, S_IRUSR | S_IWUSR) != 0)
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index ba17c4d1f25..311d7cb379f 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -300,10 +300,3 @@
 /* #define HEAPDEBUGALL */
 /* #define ACLDEBUG */
 /* #define RTDEBUG */
-
-/*
- * Automatic configuration file name for ALTER SYSTEM.
- * This file will be used to store values of configuration parameters
- * set by ALTER SYSTEM command.
- */
-#define PG_AUTOCONF_FILENAME		"postgresql.auto.conf"
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1493d2cb79c..ed6515a07e5 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -18,6 +18,13 @@
 #include "utils/array.h"
 
 
+/*
+ * Automatic configuration file name for ALTER SYSTEM.
+ * This file will be used to store values of configuration parameters
+ * set by ALTER SYSTEM command.
+ */
+#define PG_AUTOCONF_FILENAME		"postgresql.auto.conf"
+
 /*
  * Certain options can only be set at certain times. The rules are
  * like this: