diff --git a/ruby.spec b/ruby.spec
index d015e10..cb91721 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -390,6 +390,9 @@ Tcl/Tk interface for the object-oriented scripting language Ruby.
 %prep
 %setup -q -n %{ruby_archive}
 
+# Remove bundled libyaml to be sure it is not used.
+rm -rf ext/psych/yaml
+
 %patch0 -p1
 %patch1 -p1
 %patch2 -p1