1 files changed, 1 insertions, 1 deletions
diff --git a/scd/atr.c b/scd/atr.c
index b8668a41d..c3fa49f4b 100644
--- a/scd/atr.c
+++ b/scd/atr.c
@@ -50,7 +50,7 @@ atr_dump (const void *buffer, size_t buflen)
   unsigned char chksum;
   char *result;
 
-  fp = es_fopenmem (0, "rwb");
+  fp = es_fopenmem (0, "rwb,samethread");
   if (!fp)
     return NULL;