diff --git a/strbuf.h b/strbuf.h
index 23b16c6..455826c 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -179,6 +179,8 @@
 				    int reserved);
 extern void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes);
 
+extern void strbuf_add_absolute_path(struct strbuf *sb, const char *path);
+
 __attribute__((format (printf,1,2)))
 extern int printf_ln(const char *fmt, ...);
 __attribute__((format (printf,2,3)))