diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index 7b48344..cac5be4 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -529,6 +529,12 @@
     "uses": ["llvm-git-master-64bit", "node-12.9.1-64bit", "emscripten-master-64bit", "binaryen-master-64bit"],
     "os": "linux"
   },
+  {
+    "version": "upstream-master",
+    "bitness": 32,
+    "uses": ["llvm-git-master-32bit", "emscripten-master-32bit", "binaryen-master-32bit"],
+    "os": "linux"
+  },
   {
     "version": "fastcomp-master",
     "bitness": 32,