diff --git a/mfbt/Endian.h b/mfbt/Endian.h
index 9769f19337e3..04a28d61aa64 100644
--- a/mfbt/Endian.h
+++ b/mfbt/Endian.h
@@ -122,14 +122,14 @@
       defined(_POWER) || defined(__powerpc__) || \
       defined(__ppc__) || defined(__hppa) || \
       defined(_MIPSEB) || defined(__ARMEB__) || \
-      defined(__s390__) || defined(__AARCH64EB__) \
+      defined(__s390__) || defined(__AARCH64EB__) || \
       (defined(__sh__) && defined(__LITTLE_ENDIAN__)) || \
       (defined(__ia64) && defined(__BIG_ENDIAN__))
 #  define MOZ_BIG_ENDIAN 1
 #elif defined(__i386) || defined(__i386__) || \
       defined(__x86_64) || defined(__x86_64__) || \
       defined(_MIPSEL) || defined(__ARMEL__) || \
-      defined(__alpha__) || defined(__AARCH64EL__) \
+      defined(__alpha__) || defined(__AARCH64EL__) || \
       (defined(__sh__) && defined(__BIG_ENDIAN__)) || \
       (defined(__ia64) && !defined(__BIG_ENDIAN__))
 #  define MOZ_LITTLE_ENDIAN 1