diff --git a/python/mozlint/mozlint/cli.py b/python/mozlint/mozlint/cli.py
index fb42dafd4029..058a0ffe0c8c 100644
--- a/python/mozlint/mozlint/cli.py
+++ b/python/mozlint/mozlint/cli.py
@@ -113,6 +113,12 @@ def run(paths, linters, fmt, outgoing, workdir, **lintargs):
     lint = LintRoller(**lintargs)
     lint.read(find_linters(linters))
 
+    # Check if the path that is entered is a valid one.
+    invalid_paths = [path for path in paths if not os.path.exists(path)]
+    if invalid_paths:
+        print("Error: The following paths do not exist:\n{}".format("\n".join(invalid_paths)))
+        return 1
+
     # run all linters
     results = lint.roll(paths, outgoing=outgoing, workdir=workdir)
     formatter = formatters.get(fmt)