diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index da74f00..9979019 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -75,6 +75,7 @@
 #include "utils/builtins.h"
 #include "utils/bytea.h"
 #include "utils/guc_tables.h"
+#include "utils/guc_values.h"
 #include "utils/memutils.h"
 #include "utils/pg_locale.h"
 #include "utils/plancache.h"
@@ -3256,13 +3257,13 @@ static struct config_string ConfigureNamesString[] =
 	{
 		{"log_destination", PGC_SIGHUP, LOGGING_WHERE,
 			gettext_noop("Sets the destination for server log output."),
-			gettext_noop("Valid values are combinations of \"stderr\", "
-						 "\"syslog\", \"csvlog\", and \"eventlog\", "
-						 "depending on the platform."),
+			gettext_noop("Valid values are combinations of \"" GUCV_STDERR
+						  "\", \"" GUCV_SYSLOG "\", \"" GUCV_CSVLOG "\", and "
+						 "\"" GUCV_EVENTLOG "\", depending on the platform."),
 			GUC_LIST_INPUT
 		},
 		&Log_destination_string,
-		"stderr",
+		GUCV_STDERR,
 		check_log_destination, assign_log_destination, NULL
 	},
 	{
@@ -9902,16 +9903,16 @@ check_log_destination(char **newval, void **extra, GucSource source)
 	{
 		char	   *tok = (char *) lfirst(l);
 
-		if (pg_strcasecmp(tok, "stderr") == 0)
+		if (pg_strcasecmp(tok, GUCV_STDERR) == 0)
 			newlogdest |= LOG_DESTINATION_STDERR;
-		else if (pg_strcasecmp(tok, "csvlog") == 0)
+		else if (pg_strcasecmp(tok, GUCV_CSVLOG) == 0)
 			newlogdest |= LOG_DESTINATION_CSVLOG;
 #ifdef HAVE_SYSLOG
-		else if (pg_strcasecmp(tok, "syslog") == 0)
+		else if (pg_strcasecmp(tok, GUCV_SYSLOG) == 0)
 			newlogdest |= LOG_DESTINATION_SYSLOG;
 #endif
 #ifdef WIN32
-		else if (pg_strcasecmp(tok, "eventlog") == 0)
+		else if (pg_strcasecmp(tok, GUCV_EVENTLOG) == 0)
 			newlogdest |= LOG_DESTINATION_EVENTLOG;
 #endif
 		else
diff --git a/src/include/utils/guc_values.h b/src/include/utils/guc_values.h
new file mode 100644
index 0000000..cd26b5a
--- /dev/null
+++ b/src/include/utils/guc_values.h
@@ -0,0 +1,22 @@
+/*--------------------------------------------------------------------
+ * guc_values.h
+ *
+ * User-supplied GUC configuration values which are tested against
+ * user-supplied function parameters.
+ *
+ * Copyright (c) 2016, PostgreSQL Global Development Group
+ *
+ * src/include/utils/guc_values.h
+ *--------------------------------------------------------------------
+ */
+
+#ifndef GUC_VALUES_H
+#define GUC_VALUES_H
+
+/* log_destination values */
+#define GUCV_CSVLOG   "csvlog"
+#define GUCV_EVENTLOG "eventlog"
+#define GUCV_STDERR   "stderr"
+#define GUCV_SYSLOG   "syslog"
+
+#endif   /* GUC_VALUES_H */