diff --git a/webkit2gtk3.spec b/webkit2gtk3.spec
index 0067c56..1943147 100644
--- a/webkit2gtk3.spec
+++ b/webkit2gtk3.spec
@@ -1,5 +1,3 @@
-%undefine __cmake_in_source_build
-
 ## NOTE: Lots of files in various subdirectories have the same name (such as
 ## "LICENSE") so this short macro allows us to distinguish them by using their
 ## directory names (from the source tree) as prefixes for the files.