diff --git a/include/wx/html/htmldefs.h b/include/wx/html/htmldefs.h
index 20d945171a..f0c758d433 100644
--- a/include/wx/html/htmldefs.h
+++ b/include/wx/html/htmldefs.h
@@ -22,6 +22,7 @@
 
 #define wxHTML_ALIGN_LEFT            0x0000
 #define wxHTML_ALIGN_RIGHT           0x0002
+#define wxHTML_ALIGN_JUSTIFY         0x0010
 
 #define wxHTML_ALIGN_TOP             0x0004
 #define wxHTML_ALIGN_BOTTOM          0x0008