diff --git a/.github/workflows/gen-docs.yml b/.github/workflows/gen-docs.yml
index 0247dd442..19b0f4efa 100644
--- a/.github/workflows/gen-docs.yml
+++ b/.github/workflows/gen-docs.yml
@@ -32,6 +32,7 @@ jobs:
           cd build
           cmake ..
           make
+          ls
 
       - name: Cache.
         uses: actions/cache@v2
diff --git a/src/tools/md4c.cy b/src/tools/md4c.cy
index a792e2814..dc53477b9 100644
--- a/src/tools/md4c.cy
+++ b/src/tools/md4c.cy
@@ -1,5 +1,11 @@
 -- ./src/tools/cbindgen.cy -o src/tools/md4c.cy ~/repos/md4c/src/md4c.h -I/opt/homebrew/Cellar/llvm/17.0.5/include -libpath libmd4c.dylib -stripPrefix MD
 
+var Root.libPath = switch os.system:
+case 'linux' => 'libmd4c.so'
+case 'windows' => 'md4c.dll'
+case 'macos' => 'libmd4c.dylib'
+else => throw error.Unsupported
+
 -- CBINDGEN MARKER
 -- Code below is generated by cbindgen.cy
 type CHAR int
@@ -158,7 +164,7 @@ func load():
     ffi.cbind(SPAN_WIKILINK_S, [ATTRIBUTE])
     ffi.cbind(PARSER_S, [.uint, .uint, .voidPtr, .voidPtr, .voidPtr, .voidPtr, .voidPtr, .voidPtr, .voidPtr])
     ffi.cfunc('md_parse', [.voidPtr, .uint, .voidPtr, .voidPtr], .int)
-    my lib = ffi.bindLib('libmd4c.dylib', [genMap: true])
+    my lib = ffi.bindLib(libPath, [genMap: true])
     md_parse = lib.md_parse
     return lib