diff --git a/stellarium.spec b/stellarium.spec
index d2ebc12..37cdf78 100644
--- a/stellarium.spec
+++ b/stellarium.spec
@@ -1,3 +1,4 @@
+%global __cmake_in_source_build 1
 Name:           stellarium
 Version:        0.20.2
 Release:        3%{?dist}