diff --git a/configure.in b/configure.in
index c797d9cc630231a05e8b233b083e38a1d8baab53..926dc8e15e560facd0fb5b7fd40395f077c2c3af 100644
--- a/configure.in
+++ b/configure.in
@@ -113,9 +113,9 @@ if test "$docdir" = ""; then
 fi
 AC_SUBST(docdir)
 
-dovecot_pkglibexecdir=$(libexecdir)/dovecot
-dovecot_pkglibdir=$(libdir)/dovecot
-dovecot_pkgincludedir=$(includedir)/dovecot
+dovecot_pkglibexecdir='$(libexecdir)/dovecot'
+dovecot_pkglibdir='$(libdir)/dovecot'
+dovecot_pkgincludedir='$(includedir)/dovecot'
 AC_SUBST(dovecot_pkglibexecdir)
 AC_SUBST(dovecot_pkglibdir)
 AC_SUBST(dovecot_pkgincludedir)