diff --git a/ykcs11/utils.c b/ykcs11/utils.c
index 11968eb..7053456 100644
--- a/ykcs11/utils.c
+++ b/ykcs11/utils.c
@@ -76,7 +76,7 @@ CK_RV parse_readers(ykpiv_state *state, const CK_BYTE_PTR readers, const CK_ULON
         }
       }
       (*n_slots)++;
-      p += i + 1;
+      p = readers + i + 1;
     }
 
   return CKR_OK;
diff --git a/ykcs11/ykcs11.c b/ykcs11/ykcs11.c
index b710ca7..19fd60b 100644
--- a/ykcs11/ykcs11.c
+++ b/ykcs11/ykcs11.c
@@ -51,7 +51,7 @@ CK_DEFINE_FUNCTION(CK_RV, C_Initialize)(
 )
 {
   CK_BYTE readers[2048];
-  CK_ULONG len = sizeof(readers);
+  size_t len = sizeof(readers);
 
   DIN;
 
@@ -536,6 +536,7 @@ CK_DEFINE_FUNCTION(CK_RV, C_OpenSession)(
     session.info.state = CKS_RO_PUBLIC_SESSION; // Nobody has logged in, default RW session
   }
 
+  session.info.slotID = slotID;
   session.info.flags = flags;
   session.info.ulDeviceError = 0;