diff --git a/.gitignore b/.gitignore
index 8a30d258..a4fe18bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -82,6 +82,8 @@ StyleCopReport.xml
 *.pgc
 *.pgd
 *.rsp
+# but not Directory.Build.rsp, as it configures directory-level build defaults
+!Directory.Build.rsp
 *.sbr
 *.tlb
 *.tli