--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -201,7 +201,7 @@
  * support them yet.
  */
 #ifndef WIN32
-#define DEFAULT_PGSOCKET_DIR  "/tmp"
+#define DEFAULT_PGSOCKET_DIR  "/run/postgresql"
 #else
 #define DEFAULT_PGSOCKET_DIR ""
 #endif
