--- a/python/mach_commands.py
+++ b/python/mach_commands.py
@@ -214,19 +214,21 @@ class MachCommands(MachCommandBase):
         eslint for optimal use on Mozilla projects.
         """
         sys.path.append(os.path.dirname(__file__))
 
         npmPath = self.getNodeOrNpmPath("npm")
         if not npmPath:
             return 1
 
-        # Install eslint.
+        # Install eslint 1.10.3.
+        # Note that that's the version currently compatible with the mozilla
+        # eslint plugin.
         success = self.callProcess("eslint",
-                                   [npmPath, "install", "eslint", "-g"])
+                                   [npmPath, "install", "eslint@1.10.3", "-g"])
         if not success:
             return 1
 
         # Install eslint-plugin-mozilla.
         success = self.callProcess("eslint-plugin-mozilla",
                                    [npmPath, "link"],
                                    "testing/eslint-plugin-mozilla")
         if not success: