diff --git a/gen_probackup_project.pl b/gen_probackup_project.pl
index cf82543d..b78f4699 100644
--- a/gen_probackup_project.pl
+++ b/gen_probackup_project.pl
@@ -207,6 +207,7 @@ sub build_pgprobackup
         $probackup->AddIncludeDir("$pgsrc/src/interfaces/libpq");
         $probackup->AddIncludeDir("$pgsrc/src");
         $probackup->AddIncludeDir("$pgsrc/src/port");
+        $probackup->AddIncludeDir("$pgsrc/src/include/portability");
 
         $probackup->AddIncludeDir("$currpath");
         $probackup->AddIncludeDir("$currpath/src");