diff --git a/mk/main.mk b/mk/main.mk
index 293748ed3e3..9762b482ce9 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -111,8 +111,7 @@ CFG_RUSTC_FLAGS := $(RUSTFLAGS)
 CFG_GCCISH_CFLAGS :=
 CFG_GCCISH_LINK_FLAGS :=
 
-# Turn off broken quarantine (see jemalloc/jemalloc#161)
-CFG_JEMALLOC_FLAGS := --disable-fill
+CFG_JEMALLOC_FLAGS :=
 
 ifdef CFG_DISABLE_OPTIMIZE
   $(info cfg: disabling rustc optimization (CFG_DISABLE_OPTIMIZE))