diff --git a/psi-plus.spec b/psi-plus.spec
index 140c7d3..f009cc1 100644
--- a/psi-plus.spec
+++ b/psi-plus.spec
@@ -1,4 +1,3 @@
-%undefine __cmake_in_source_build
 %global version_l10n 1.5.1619
 
 Name:           psi-plus