diff --git a/codecAO40.c b/codecAO40.c
index f1646e46..5674a7b6 100644
--- a/codecAO40.c
+++ b/codecAO40.c
@@ -1,6 +1,12 @@
 #include <string.h>
 #include "codecAO40.h"
 
+    unsigned char m_RS_block[RSBLOCKS][NROOTS]; /* RS parity blocks */
+    unsigned char m_encoded[SYMPBLOCK] ;       /* encoded symbols */
+    int m_encoded_bytes;               /* Byte counter for encode_data() */
+    int m_ileaver_index;               /* Byte counter for interleaver */
+    unsigned char m_conv_sr;           /* Convolutional encoder shift register state */
+
 /* ---------------------- */
 /* AO40 Encoder - Decoder */
 /* ---------------------- */