diff --git a/src/include/port.h b/src/include/port.h
index 20a5de1b7a..3b6d7ef513 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -521,4 +521,38 @@ extern char *wait_result_to_str(int exit_status);
 extern bool wait_result_is_signal(int exit_status, int signum);
 extern bool wait_result_is_any_signal(int exit_status, bool include_command_not_found);
 
+#if _MSC_VER >= 1800
+	//From VS2012.
+typedef struct localerefcount
+{
+	char *locale;
+	wchar_t *wlocale;
+	int *refcount;
+	int *wrefcount;
+} locrefcount;
+
+	//From VS2012.
+typedef struct __crt_locale_data
+{
+	int refcount;
+	unsigned int lc_codepage;
+	unsigned int lc_collate_cp;
+	unsigned int lc_time_cp;
+	locrefcount lc_category[6];
+	int lc_clike;
+	int mb_cur_max;
+	int * lconv_intl_refcount;
+	int * lconv_num_refcount;
+	int * lconv_mon_refcount;
+	struct lconv * lconv;
+	int * ctype1_refcount;
+	unsigned short * ctype1;
+	const unsigned short * pctype;
+	const unsigned char * pclmap;
+	const unsigned char * pcumap;
+	struct __lc_time_data * lc_time_curr;
+	wchar_t * locale_name[6];
+} threadlocinfo;
+#endif
+
 #endif							/* PG_PORT_H */