diff --git a/git-compat-util.h b/git-compat-util.h
index 35b095e..34f040f 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -162,6 +162,11 @@
 #define probe_utf8_pathname_composition(a,b)
 #endif
 
+#ifdef MKDIR_WO_TRAILING_SLASH
+#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
+extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
+#endif
+
 #ifndef NO_LIBGEN_H
 #include <libgen.h>
 #else