diff --git a/mk/cfg/i686-pc-windows-gnu.mk b/mk/cfg/i686-pc-windows-gnu.mk
index 0ed65effbdf..3426b30aeeb 100644
--- a/mk/cfg/i686-pc-windows-gnu.mk
+++ b/mk/cfg/i686-pc-windows-gnu.mk
@@ -25,5 +25,3 @@ CFG_GNU_TRIPLE_i686-pc-windows-gnu := i686-w64-mingw32
 CFG_THIRD_PARTY_OBJECTS_i686-pc-windows-gnu := crt2.o dllcrt2.o
 CFG_INSTALLED_OBJECTS_i686-pc-windows-gnu := crt2.o dllcrt2.o rsbegin.o rsend.o
 CFG_RUSTRT_HAS_STARTUP_OBJS_i686-pc-windows-gnu := 1
-# FIXME(#31030) - there's not a great reason to disable jemalloc here
-CFG_DISABLE_JEMALLOC_i686-pc-windows-gnu := 1
diff --git a/mk/cfg/x86_64-pc-windows-gnu.mk b/mk/cfg/x86_64-pc-windows-gnu.mk
index f7fc4a2f26a..f0732d08c71 100644
--- a/mk/cfg/x86_64-pc-windows-gnu.mk
+++ b/mk/cfg/x86_64-pc-windows-gnu.mk
@@ -25,5 +25,3 @@ CFG_GNU_TRIPLE_x86_64-pc-windows-gnu := x86_64-w64-mingw32
 CFG_THIRD_PARTY_OBJECTS_x86_64-pc-windows-gnu := crt2.o dllcrt2.o
 CFG_INSTALLED_OBJECTS_x86_64-pc-windows-gnu := crt2.o dllcrt2.o rsbegin.o rsend.o
 CFG_RUSTRT_HAS_STARTUP_OBJS_x86_64-pc-windows-gnu := 1
-# FIXME(#31030) - there's not a great reason to disable jemalloc here
-CFG_DISABLE_JEMALLOC_x86_64-pc-windows-gnu := 1
diff --git a/src/jemalloc b/src/jemalloc
index e24a1a025a1..aab1c0a0e0b 160000
--- a/src/jemalloc
+++ b/src/jemalloc
@@ -1 +1 @@
-Subproject commit e24a1a025a1f214e40eedafe3b9c7b1d69937922
+Subproject commit aab1c0a0e0b39825b16673128729ef46310a5da8