diff --git a/include/wx/html/htmldefs.h b/include/wx/html/htmldefs.h
index 225625d4dd..38f74088d4 100644
--- a/include/wx/html/htmldefs.h
+++ b/include/wx/html/htmldefs.h
@@ -93,8 +93,6 @@
     /* size of one scroll step of wxHtmlWindow in pixels */
 #define wxHTML_BUFLEN                  1024
     /* size of temporary buffer used during parsing */
-#define wxHTML_REALLOC_STEP              32
-    /* steps of array reallocation */
 #define wxHTML_PRINT_MAX_PAGES          999
     /* maximum number of pages printable via html printing */