1 files changed, 2 insertions, 2 deletions

diff --git a/src/xterm.c b/src/xterm.c
index 06a40fcdf7e..e910de5b281 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -6930,8 +6930,8 @@ x_term_init (display_name, xrm_option, resource_name)
 #endif /* ! 0 */
 
   dpyinfo->x_id_name
-    = (char *) xmalloc (XSTRING (Vinvocation_name)->size
-                        + XSTRING (Vsystem_name)->size
+    = (char *) xmalloc (XSTRING (Vinvocation_name)->size_byte
+                        + XSTRING (Vsystem_name)->size_byte
                         + 2);
   sprintf (dpyinfo->x_id_name, "%s@%s",
            XSTRING (Vinvocation_name)->data, XSTRING (Vsystem_name)->data);