--- a/memory/mozjemalloc/jemalloc.c
+++ b/memory/mozjemalloc/jemalloc.c
@@ -504,23 +504,39 @@ static pthread_key_t tlsIndex;
 #  define QUANTUM_2POW_MIN	4
 #  define SIZEOF_PTR_2POW	3
 #  define CPU_SPINWAIT		__asm__ volatile("pause")
 #endif
 #ifdef __arm__
 #  define QUANTUM_2POW_MIN	3
 #  define SIZEOF_PTR_2POW	2
 #endif
+#ifdef __aarch64__
+#  define QUANTUM_2POW_MIN	4
+#  define SIZEOF_PTR_2POW	3
+#endif
 #ifdef __mips__
 #  define QUANTUM_2POW_MIN	3
-#  define SIZEOF_PTR_2POW	2
+#  ifdef __mips_n64
+#    define SIZEOF_PTR_2POW	3
+#  else
+#    define SIZEOF_PTR_2POW	2
+#  endif
 #endif
 #ifdef __powerpc__
 #  define QUANTUM_2POW_MIN	4
-#  define SIZEOF_PTR_2POW	2
+#  ifdef __powerpc64__
+#    define SIZEOF_PTR_2POW	3
+#  else
+#    define SIZEOF_PTR_2POW	2
+#  endif
+#endif
+#ifdef __riscv__
+#  define QUANTUM_2POW_MIN	4
+#  define SIZEOF_PTR_2POW	3
 #endif
 #endif
 
 #define	SIZEOF_PTR		(1U << SIZEOF_PTR_2POW)
 
 /* sizeof(int) == (1U << SIZEOF_INT_2POW). */
 #ifndef SIZEOF_INT_2POW
 #  define SIZEOF_INT_2POW	2