diff --git a/admin/dump.c b/admin/dump.c
index e4b40ae73..5da100c2c 100644
--- a/admin/dump.c
+++ b/admin/dump.c
@@ -66,7 +66,7 @@ static void
 append_hex(char *str, krb5_data *data)
 {
     int i;
-    char *p = malloc(data->length * 2 + 1);
+    char *p = calloc(1, data->length * 2 + 1);
     for(i = 0; i < data->length; i++)
 	sprintf(p + 2 * i, "%02x", ((u_char*)data->data)[i]);
     strcat(str, p);
diff --git a/kadmin/dump.c b/kadmin/dump.c
index e4b40ae73..5da100c2c 100644
--- a/kadmin/dump.c
+++ b/kadmin/dump.c
@@ -66,7 +66,7 @@ static void
 append_hex(char *str, krb5_data *data)
 {
     int i;
-    char *p = malloc(data->length * 2 + 1);
+    char *p = calloc(1, data->length * 2 + 1);
     for(i = 0; i < data->length; i++)
 	sprintf(p + 2 * i, "%02x", ((u_char*)data->data)[i]);
     strcat(str, p);