diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index 76e6693..b1d5792 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -749,6 +749,12 @@
     "activated_cfg": "CRUNCH='%installation_dir%/crunch'",
     "activated_path": "%installation_dir%"
   },
+  {
+    "id": "gnu", // Would really want to name this 'grep' but llvm-lit has a bug that it fails to find 'grep' tool if it is located in a directory that has the word 'grep' as a substring.
+    "version": "2.5.4",
+    "windows_url": "grep-2.5.4.zip",
+    "activated_path": "%installation_dir%/bin"
+  },
   {
     "id": "mingw",
     "version": "4.6.2",