diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2043f133f..9fc9a1812 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -88,10 +88,10 @@ jobs:
               run: python test.py mypy
 
             - name: Build man page
-              run: make FAIL_WARN=-W man
+              run: make FAIL_WARN=1 man
 
             - name: Build HTML docs
-              run: make FAIL_WARN=-W html
+              run: make FAIL_WARN=1 html
 
     bundle:
         name: Bundle test (${{ matrix.os }})
diff --git a/docs/Makefile b/docs/Makefile
index 6455cbb5e..4ec575b13 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -1,6 +1,10 @@
 # Minimal makefile for Sphinx documentation
 #
 
+ifdef FAIL_WARN
+FAIL_WARN=-W
+endif
+
 # You can set these variables from the command line.
 SPHINXOPTS    = -n -q -j auto -T $(FAIL_WARN) $(OPTS)
 SPHINXBUILD   = sphinx-build
diff --git a/publish.py b/publish.py
index c77f95104..79af31a8f 100755
--- a/publish.py
+++ b/publish.py
@@ -79,11 +79,11 @@ def run_tag(args: Any) -> None:
 
 
 def run_man(args: Any) -> None:
-    call('make FAIL_WARN=-W man', cwd=docs_dir)
+    call('make FAIL_WARN=1 man', cwd=docs_dir)
 
 
 def run_html(args: Any) -> None:
-    call('make FAIL_WARN=-W "OPTS=-D analytics_id=UA-20736318-2" dirhtml', cwd=docs_dir)
+    call('make FAIL_WARN=1 "OPTS=-D analytics_id=UA-20736318-2" dirhtml', cwd=docs_dir)
     add_old_redirects('docs/_build/dirhtml')