diff --git a/modules/xz-embedded/moz.build b/modules/xz-embedded/moz.build
index a7b96a9d7987..f80c93c65b6f 100644
--- a/modules/xz-embedded/moz.build
+++ b/modules/xz-embedded/moz.build
@@ -21,15 +21,10 @@ UNIFIED_SOURCES += [
 
 AllowCompilerWarnings()
 
-if CONFIG['TARGET_CPU'] == 'arm':
-    # Accept arm, armv7, etc.
-    if CONFIG['MOZ_THUMB2']:
-        DEFINES['XZ_DEC_ARMTHUMB'] = 1
-    else:
-        DEFINES['XZ_DEC_ARM'] = 1
-elif CONFIG['INTEL_ARCHITECTURE']:
-    # Accept x86, x86_64, i386, i686, etc.
-    DEFINES['XZ_DEC_X86'] = 1
+# Accept arm, armv7, etc.
+DEFINES['XZ_DEC_ARM'] = 1
+# Accept x86, x86_64, i386, i686, etc.
+DEFINES['XZ_DEC_X86'] = 1
 
 DEFINES['XZ_USE_CRC64'] = 1