Index: head/contrib/jemalloc/include/jemalloc/internal/jemalloc_internal.h
===================================================================
--- head/contrib/jemalloc/include/jemalloc/internal/jemalloc_internal.h
+++ head/contrib/jemalloc/include/jemalloc/internal/jemalloc_internal.h
@@ -253,6 +253,9 @@
 #  ifdef __powerpc__
 #    define LG_QUANTUM		4
 #  endif
+#  ifdef __riscv__
+#    define LG_QUANTUM		4
+#  endif
 #  ifdef __s390__
 #    define LG_QUANTUM		4
 #  endif
Index: head/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
===================================================================
--- head/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
+++ head/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
@@ -52,6 +52,9 @@
 #elif defined(__powerpc__)
 #  define LG_SIZEOF_PTR		2
 #endif
+#ifdef __riscv__
+#  define LG_SIZEOF_PTR		3
+#endif
 
 #ifndef JEMALLOC_TLS_MODEL
 #  define JEMALLOC_TLS_MODEL	/* Default. */