diff --git a/src/libasn1/asn1uper.h b/src/libasn1/asn1uper.h
index e94f152..359b194 100644
--- a/src/libasn1/asn1uper.h
+++ b/src/libasn1/asn1uper.h
@@ -24,6 +24,8 @@
 #define uper_get_bits_length(U,S) (uper_get_bits_stream(U,S)+1)
 #define uper_put_bits_length(U,L,S) uper_put_bits_stream(U,(L)-1,S)
 
+#define uper_get_seq_length(U,S) (uper_get_bits_stream(U,S)+1)
+
 #define uper_init_extension(E)  asn1_init_extension(E)
 #define uper_init_bitstream(E)  asn1_init_bitstream(E)
 
diff --git a/src/libasn1/uper_get_ext.c b/src/libasn1/uper_get_ext.c
index 789df92..54e273b 100644
--- a/src/libasn1/uper_get_ext.c
+++ b/src/libasn1/uper_get_ext.c
@@ -74,8 +74,8 @@ uint uper_get_extension(UPER_Stream *uper, UPER_Extension *ext, uint noptions, u
   
   // check for options
   if (noptions) {
-    ext->value = uper_get_bits_stream(uper, noptions);
     ext->options = noptions;
+    ext->value = uper_get_bits_stream(uper, noptions);
   }
   else
     ext->options = 0;
@@ -120,7 +120,7 @@ uint uper_get_ext_optional(UPER_Extension *ext, uint bit)
   if (!ext || (bit>=ext->options))
     return 0;
   
-  return (ext->value & 1<<(ext->options-bit));
+  return (ext->value & 1<<(ext->options-bit-1));
 }
 
 uint uper_get_ext_skip(UPER_Stream *uper, UPER_Extension *ext)