--- a/memory/build/mozjemalloc_compat.c
+++ b/memory/build/mozjemalloc_compat.c
@@ -63,16 +63,22 @@ malloc_good_size_impl(size_t size)
 
 MOZ_JEMALLOC_API void
 jemalloc_stats_impl(jemalloc_stats_t *stats)
 {
   unsigned narenas;
   size_t active, allocated, mapped, page, pdirty;
   size_t lg_chunk;
 
+  // Refresh jemalloc's stats by updating its epoch, see ctl_refresh in
+  // src/ctl.c
+  uint64_t epoch = 0;
+  size_t esz = sizeof(epoch);
+  int ret = je_(mallctl)("epoch", &epoch, &esz, &epoch, esz);
+
   CTL_GET("arenas.narenas", narenas);
   CTL_GET("arenas.page", page);
   CTL_GET("stats.active", active);
   CTL_GET("stats.allocated", allocated);
   CTL_GET("stats.mapped", mapped);
   CTL_GET("opt.lg_chunk", lg_chunk);
 
   /* get the summation for all arenas, i == narenas */