diff --git a/llvm.spec b/llvm.spec
index 0d79f49..ebeb41c 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -371,7 +371,7 @@ BuildRequires: procps-ng
 # For reproducible pyc file generation
 # See https://docs.fedoraproject.org/en-US/packaging-guidelines/Python_Appendix/#_byte_compilation_reproducibility
 # Since Fedora 41 this happens automatically, and RHEL 8 does not support this.
-%if (%{defined fedora} && 0%{?fedora} < 41) || 0%{?rhel} == 9 || 0%{?rhel} == 10
+%if %{without compat_build} && ((%{defined fedora} && 0%{?fedora} < 41) || 0%{?rhel} == 9 || 0%{?rhel} == 10)
 BuildRequires: /usr/bin/marshalparser
 %global py_reproducible_pyc_path %{buildroot}%{python3_sitelib}
 %endif