diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 315ecbd..562fae5 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,7 +1,9 @@
 #Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 #reals
-add_subdirectory(reals)
+if(${build_reals})
+    add_subdirectory(reals)
+endif()
 
 #unittests
 if(${run_unittests})