diff --git a/dep/emu/build.py b/dep/emu/build.py
index a18f4db6..d7e0b977 100644
--- a/dep/emu/build.py
+++ b/dep/emu/build.py
@@ -1,3 +1,7 @@
 from build.c import clibrary
 
-clibrary(name="emu", srcs=["./fnmatch.c"], hdrs={"fnmatch.h": "./fnmatch.h"})
+clibrary(
+    name="emu",
+    srcs=["./fnmatch.c", "./charclass.h"],
+    hdrs={"fnmatch.h": "./fnmatch.h"},
+)