diff --git a/thunderbird.spec b/thunderbird.spec
index a796e05..c4d07c3 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -386,6 +386,8 @@ BuildRequires:    perl-interpreter
 BuildRequires:    gcc-c++
 BuildRequires:    xmlto
 %endif
+#RHEL9
+BuildRequires:    perl-interpreter
 
 Requires:       mozilla-filesystem
 Requires:       p11-kit-trust