diff --git a/polymake.spec b/polymake.spec
index a8bbb25..f9c7f1b 100644
--- a/polymake.spec
+++ b/polymake.spec
@@ -7,7 +7,7 @@
 # rebuilt, because each BRs the other and both are linked against the old
 # version of the library.  Use this to rebuild polymake without Singular
 # support, rebuild Singular, then build polymake again with Singular support.
-%bcond_without singular
+%bcond_with singular
 
 # Date of the "perpetual beta" git snapshot
 %global gitdate  20141013