diff --git a/ui/build/config.go b/ui/build/config.go
index 9a8a3fb..c01bf4c 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -83,6 +83,10 @@
 
 		// We handle this above
 		"OUT_DIR_COMMON_BASE",
+
+		// Variables that have caused problems in the past
+		"DISPLAY",
+		"GREP_OPTIONS",
 	)
 
 	// Tell python not to spam the source tree with .pyc files.