diff --git a/configure b/configure
index 5602be24..3fad424c 100755
--- a/configure
+++ b/configure
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 # Store original IFS value so it can be changed (and restored) in many places.
-readonly DEFAULT_IFS=$IFS
+readonly DEFAULT_IFS="$IFS"
 
 srcdir=$(dirname "$0")