diff --git a/compat.h b/compat.h
index 55fbad48..8d71a9cf 100644
--- a/compat.h
+++ b/compat.h
@@ -463,6 +463,9 @@ int		 utf8proc_wctomb(char *, wchar_t);
 #ifdef NEED_FUZZING
 /* tmux.c */
 #define main __weak main
+#define regcomp(preg, pattern, cflags) (0)
+#define regexec(preg, string, nmatch, pmatch, eflags) (REG_NOMATCH)
+#define regfree(preg) ((void)0)
 #endif
 
 /* getopt.c */