diff --git a/build.sh b/build.sh
index 1e7c4663e..2b1bc03a5 100755
--- a/build.sh
+++ b/build.sh
@@ -57,5 +57,5 @@ if [ "$REALANTHOME" != "" ] ; then
   ANT_INSTALL="-Dant.install=$REALANTHOME"
 fi
 
-bootstrap/bin/ant -emacs $ANT_INSTALL $*
+bootstrap/bin/ant -emacs "$ANT_INSTALL" $*