diff --git a/projects/freetype2/project.yaml b/projects/freetype2/project.yaml
index 7b40cb148..326fea15e 100644
--- a/projects/freetype2/project.yaml
+++ b/projects/freetype2/project.yaml
@@ -5,3 +5,4 @@ auto_ccs:
   - "lemzwerg@googlemail.com"
 sanitizers:
   - address
+  - undefined