diff --git a/thunderbird.spec b/thunderbird.spec
index f895ee3..97cb9e0 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -619,7 +619,7 @@ echo "use_rustts            %{?use_rustts}"
 %patch77 -p1 -b .mozilla-1775202
 
 %patch73 -p1 -b .build-ascii-decode-fail-rhel7
-%if 0%{?rhel} == 7 || (0%{?rhel} == 8 && %{rhel_minor_version} >= 9)
+%if 0%{?rhel} == 7 || (0%{?rhel} == 8 && %{rhel8_minor_version} >= 9)
 %patch78 -p1 -b .build-rhel7-lower-node-min-version
 %endif