diff --git a/src/groupmems.c b/src/groupmems.c
index a369a619..0d0882db 100644
--- a/src/groupmems.c
+++ b/src/groupmems.c
@@ -127,7 +127,7 @@ static void add_user (const char *user,
 			static struct sgrp sgrent;
 			sgrent.sg_name = xstrdup (newgrp->gr_name);
 			sgrent.sg_mem = dup_list (newgrp->gr_mem);
-			sgrent.sg_adm = XMALLOC(1, char *);
+			sgrent.sg_adm = XMALLOC(2, char *);
 #ifdef FIRST_MEMBER_IS_ADMIN
 			if (sgrent.sg_mem[0]) {
 				sgrent.sg_adm[0] = xstrdup (sgrent.sg_mem[0]);
@@ -210,7 +210,7 @@ static void remove_user (const char *user,
 			static struct sgrp sgrent;
 			sgrent.sg_name = xstrdup (newgrp->gr_name);
 			sgrent.sg_mem = dup_list (newgrp->gr_mem);
-			sgrent.sg_adm = XMALLOC(1, char *);
+			sgrent.sg_adm = XMALLOC(2, char *);
 #ifdef FIRST_MEMBER_IS_ADMIN
 			if (sgrent.sg_mem[0]) {
 				sgrent.sg_adm[0] = xstrdup (sgrent.sg_mem[0]);