diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 94c3c73e41..7cbdeb589b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -131,6 +131,7 @@ install: all installdirs install-lib
 	$(INSTALL_DATA) $(srcdir)/libpq-fe.h '$(DESTDIR)$(includedir)'
 	$(INSTALL_DATA) $(srcdir)/libpq-events.h '$(DESTDIR)$(includedir)'
 	$(INSTALL_DATA) $(srcdir)/libpq-int.h '$(DESTDIR)$(includedir_internal)'
+	$(INSTALL_DATA) $(srcdir)/fe-auth-sasl.h '$(DESTDIR)$(includedir_internal)'
 	$(INSTALL_DATA) $(srcdir)/pqexpbuffer.h '$(DESTDIR)$(includedir_internal)'
 	$(INSTALL_DATA) $(srcdir)/pg_service.conf.sample '$(DESTDIR)$(datadir)/pg_service.conf.sample'
 
@@ -144,6 +145,7 @@ uninstall: uninstall-lib
 	rm -f '$(DESTDIR)$(includedir)/libpq-fe.h'
 	rm -f '$(DESTDIR)$(includedir)/libpq-events.h'
 	rm -f '$(DESTDIR)$(includedir_internal)/libpq-int.h'
+	rm -f '$(DESTDIR)$(includedir_internal)/fe-auth-sasl.h'
 	rm -f '$(DESTDIR)$(includedir_internal)/pqexpbuffer.h'
 	rm -f '$(DESTDIR)$(datadir)/pg_service.conf.sample'
 
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index de22c9ba2c..c932322e35 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -633,7 +633,8 @@ sub CopyIncludeFiles
 	CopyFiles(
 		'Libpq internal headers',
 		$target . '/include/internal/',
-		'src/interfaces/libpq/', 'libpq-int.h', 'pqexpbuffer.h');
+		'src/interfaces/libpq/', 'libpq-int.h', 'fe-auth-sasl.h',
+		'pqexpbuffer.h');
 
 	CopyFiles(
 		'Internal headers',