diff --git a/perf.spec b/perf.spec
index afc9db5..51d012c 100644
--- a/perf.spec
+++ b/perf.spec
@@ -34,9 +34,18 @@ ExcludeArch:    %{ix86}
 BuildRequires:  make
 BuildRequires:  bison
 BuildRequires:  flex
+%if 0%{?facebook}
+%if 0%{?el9}
+# Temporarily pin to building against the older clang
+# so this works against an older Stream snapshot
+BuildRequires:  clang = 18.1.8-3.el9
+BuildRequires:  llvm-devel = 18.1.8-3.el9
+%endif
+%else
 BuildRequires:  clang
-BuildRequires:  gcc
 BuildRequires:  llvm-devel
+%endif
+BuildRequires:  gcc
 BuildRequires:  binutils-devel
 BuildRequires:  capstone-devel
 BuildRequires:  elfutils-devel