1 files changed, 1 insertions, 1 deletions
diff --git a/driver.c b/driver.c
index b0f0b5f6..89137ca9 100644
--- a/driver.c
+++ b/driver.c
@@ -606,7 +606,7 @@ struct query *ctl;	/* query control record */
 		 */
 		for (idp = xmit_names; idp; idp = idp->next)
 		    nlocals++;
-		sp = sargv = (char **)alloca(ctl->mda_argcount+nlocals+2);
+		sp = sargv = (char **)alloca(sizeof(char **) * ctl->mda_argcount+nlocals+2);
 		for (i = 0; i < ctl->mda_argcount; i++)
 		    *sp++ = ctl->mda_argv[i];
 		for (idp = xmit_names; idp; idp = idp->next)