diff --git a/grepdefine b/grepdefine
index 3e8e72d..a5cf750 100755
--- a/grepdefine
+++ b/grepdefine
@@ -5,4 +5,4 @@ where="$2"
 if [[ "x$where" == "x" ]]; then
     where=.
 fi
-exec grep --exclude-dir .svn --color=auto -R "define *\\<${define}\\>" ${where}
+exec grep --exclude-dir .svn --color=auto -RI "define *\\<${define}\\>" ${where}