diff --git a/configure.in b/configure.in
index 6d24cadfb..2bf9c5692 100644
--- a/configure.in
+++ b/configure.in
@@ -148,7 +148,7 @@ dnl ---------------------------------------------------------------------------
 AC_MSG_CHECKING(where to install camlibs)
 AC_ARG_WITH(camlibdir,
   [  --with-camlibdir=<path>   install camlibs in directory <path> ],
-  camlibdir="$withval", camlibdir="${libdir}/gphoto2")
+  camlibdir="$withval", camlibdir='${libdir}/gphoto2')
 AC_MSG_RESULT("$camlibdir")
 AC_SUBST(camlibdir)