diff --git a/src/cw/format.h b/src/cw/format.h
index e6a83356..5d61a7eb 100644
--- a/src/cw/format.h
+++ b/src/cw/format.h
@@ -45,7 +45,6 @@ char *format_s_hex_bytes(char *dst, const char *format, const char *delim,
 
 int cw_format_scan_hex_bytes(uint8_t *dst,const char *s, int len);
 
-struct avltree;
 
 /**
  * Format bytes as a hex string. Hexadecimal letters are lower-case.