diff --git a/Makefile b/Makefile
index c060363f11c3d816aecc0d8da7af9dbd233edb9c..2f6c0e9c684a18430a8676574550677b9b5e2554 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,9 @@ LC_COLLATE=C
 LC_NUMERIC=C
 export LC_COLLATE LC_NUMERIC
 
+# Avoid interference with shell env settings
+unexport GREP_OPTIONS
+
 # We are using a recursive build, so we need to do a little thinking
 # to get the ordering right.
 #