diff --git a/ChangeLog b/ChangeLog
index ac2e4d3c..118df96f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -28,6 +28,8 @@ brevity.  Much more detail can be found in the git revision history:
     deadlocks during thread exit.  (@jasone)
   - Fix over-sized allocation of radix tree leaf nodes.  (@mjp41, @ogaun,
     @jasone)
+  - Fix over-sized allocation of arena_t (plus associated stats) data
+    structures.  (@jasone, @interwq)
   - Fix EXTRA_CFLAGS to not affect configuration.  (@jasone)
   - Fix a Valgrind integration bug.  (@ronawho)
   - Disallow 0x5a junk filling when running in Valgrind.  (@jasone)
diff --git a/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj b/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj
index 9315022d..8342ab3a 100644
--- a/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj
+++ b/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj
@@ -69,12 +69,14 @@
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\rb.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\rtree.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\size_classes.h" />
+    <ClInclude Include="..\..\..\..\include\jemalloc\internal\smoothstep.h" />
+    <ClInclude Include="..\..\..\..\include\jemalloc\internal\spin.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\stats.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\tcache.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\ticker.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\tsd.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\util.h" />
-    <ClInclude Include="..\..\..\..\include\jemalloc\internal\valgrind.h" />
+    <ClInclude Include="..\..\..\..\include\jemalloc\internal\witness.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\jemalloc.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\jemalloc_defs.h" />
     <ClInclude Include="..\..\..\..\include\jemalloc\jemalloc_macros.h" />
@@ -110,11 +112,13 @@
     <ClCompile Include="..\..\..\..\src\prof.c" />
     <ClCompile Include="..\..\..\..\src\quarantine.c" />
     <ClCompile Include="..\..\..\..\src\rtree.c" />
+    <ClCompile Include="..\..\..\..\src\spin.c" />
     <ClCompile Include="..\..\..\..\src\stats.c" />
     <ClCompile Include="..\..\..\..\src\tcache.c" />
     <ClCompile Include="..\..\..\..\src\ticker.c" />
     <ClCompile Include="..\..\..\..\src\tsd.c" />
     <ClCompile Include="..\..\..\..\src\util.c" />
+    <ClCompile Include="..\..\..\..\src\witness.c" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{8D6BB292-9E1C-413D-9F98-4864BDC1514A}</ProjectGuid>
diff --git a/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj.filters b/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj.filters
index 88c15efa..37f0f02a 100644
--- a/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj.filters
+++ b/msvc/projects/vc2015/jemalloc/jemalloc.vcxproj.filters
@@ -146,6 +146,12 @@
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\size_classes.h">
       <Filter>Header Files\internal</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\include\jemalloc\internal\smoothstep.h">
+      <Filter>Header Files\internal</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\..\..\include\jemalloc\internal\spin.h">
+      <Filter>Header Files\internal</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\stats.h">
       <Filter>Header Files\internal</Filter>
     </ClInclude>
@@ -161,7 +167,7 @@
     <ClInclude Include="..\..\..\..\include\jemalloc\internal\util.h">
       <Filter>Header Files\internal</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\..\..\include\jemalloc\internal\valgrind.h">
+    <ClInclude Include="..\..\..\..\include\jemalloc\internal\witness.h">
       <Filter>Header Files\internal</Filter>
     </ClInclude>
     <ClInclude Include="..\..\..\..\include\msvc_compat\strings.h">
@@ -241,6 +247,9 @@
     <ClCompile Include="..\..\..\..\src\rtree.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\spin.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\stats.c">
       <Filter>Source Files</Filter>
     </ClCompile>
@@ -256,5 +265,8 @@
     <ClCompile Include="..\..\..\..\src\util.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\witness.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/src/arena.c b/src/arena.c
index 43c3ccf2..d737ec9a 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -3461,8 +3461,8 @@ arena_new(tsdn_t *tsdn, unsigned ind)
 	if (config_stats) {
 		arena = (arena_t *)base_alloc(tsdn,
 		    CACHELINE_CEILING(sizeof(arena_t)) +
-		    QUANTUM_CEILING((nlclasses * sizeof(malloc_large_stats_t)) +
-		    (nhclasses * sizeof(malloc_huge_stats_t))));
+		    QUANTUM_CEILING((nlclasses * sizeof(malloc_large_stats_t)))
+		    + (nhclasses * sizeof(malloc_huge_stats_t)));
 	} else
 		arena = (arena_t *)base_alloc(tsdn, sizeof(arena_t));
 	if (arena == NULL)