diff --git a/firefox.spec b/firefox.spec
index cce344e..7f57caf 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -7,37 +7,26 @@
 %global debug_package %{nil}
 %endif
 
-%global rhel_minor_version -1
-%if 0%{?flatpak:1}
-%global rhel_minor_version 4
-%endif
-%if "%{?dist}" == ".el8"
-%global rhel_minor_version 5
-%endif
-%if "%{?dist}" == ".el8_4"
-%global rhel_minor_version 4
-%endif
-%if "%{?dist}" == ".el8_3"
-%global rhel_minor_version 3
-%endif
-%if "%{?dist}" == ".el8_2"
-%global rhel_minor_version 2
-%endif
-%if "%{?dist}" == ".el8_1"
-%global rhel_minor_version 1
-%endif
-%if "%{?dist}" == ".el8_0"
-%global rhel_minor_version 0
-%endif
-%if "%{?dist}" == ".el9"
-%global rhel_minor_version 4
-%endif
+%{lua:
+function dist_to_rhel_minor(str, start)
+  match = string.match(str, ".module%+el8.%d+")
+  if match then
+     return string.sub(match, 13)
+  end
+  match = string.match(str, ".el8_%d+")
+  if match then
+     return string.sub(match, 6)
+  end
+  return -1
+end}
+
+%global rhel_minor_version %{lua:print(dist_to_rhel_minor(rpm.expand("%dist")))}
 
 %global system_nss        1
 %global bundle_nss        0
 
 %if 0%{?rhel} >= 8
-  %if 0%{?rhel_minor_version} < 2
+  %if %{rhel_minor_version} < 2
 %global bundle_nss        1
   %endif
 %endif
@@ -160,7 +149,7 @@
 %define use_bundled_yasm        0
 
 %if 0%{?rhel} >= 8
-  %if 0%{?rhel_minor_version} <= 2
+  %if %{rhel_minor_version} <= 2
 %define use_bundled_nodejs      1
   %endif
 %endif
@@ -383,7 +372,7 @@ BuildRequires:  openssl-devel
 %endif
 
 %if 0%{?rhel} >= 8
-  %if 0%{?rhel_minor_version} >= 3
+  %if %{rhel_minor_version} >= 3
 BuildRequires:  pkgconfig(libpipewire-0.3)
   %else
 BuildRequires:  pipewire-devel
@@ -608,7 +597,7 @@ https://extensions.gnome.org.
 %prep
 echo "Build environment"
 echo "dist                  %{?dist}"
-echo "RHEL 8 minor version: %{?rhel_minor_version}"
+echo "RHEL 8 minor version: %{rhel_minor_version}"
 echo "use_bundled_ffi       %{?use_bundled_ffi}"
 echo "use_bundled_python_2  %{?use_bundled_python_2}"
 echo "use_bundled_python_3  %{?use_bundled_python_3}"
@@ -651,7 +640,7 @@ sed -ie 's|/usr/include|/app/include|' %_sourcedir/firefox-pipewire-0-3.patch
 %endif
 
 %if 0%{?rhel} >= 8
-  %if 0%{?rhel_minor_version} >= 3
+  %if %{rhel_minor_version} >= 3
 %patch235 -p1 -b .pipewire-0-3
 
   %else