diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45a1038..5ba802a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@ this project uses date-based 'snapshot' version identifiers.
 - Extend version string normalisation during checks
   (see issue \#96)
 
+### Fixed
+- Return passing errorlevel if BibTeX issues warnings
+  (see \#260)
+
 ## [2023-09-07]
 
 ### Changed
diff --git a/l3build-typesetting.lua b/l3build-typesetting.lua
index d0e491d..c12c544 100644
--- a/l3build-typesetting.lua
+++ b/l3build-typesetting.lua
@@ -72,8 +72,10 @@ function bibtex(name,dir)
         os_grepexe .. " \"^" .. grep .. "bibdata{\" " .. name .. ".aux > "
           .. os_null
       ) == 0 then
-      return runcmd(bibtexexe .. " " .. bibtexopts .. " " .. name,dir,
-        {"BIBINPUTS","BSTINPUTS"})
+      local errorlevel = runcmd(bibtexexe .. " " .. bibtexopts .. " " .. name,
+        dir,{"BIBINPUTS","BSTINPUTS"})
+      -- BibTeX(8) signals warnings with errorlevel 1
+      if errorlevel > 1 then return errorlevel else return 0 end
     end
   end
   return 0