diff --git a/armsrc/appmain.h b/armsrc/appmain.h
index 141c943f9..8baff4db1 100644
--- a/armsrc/appmain.h
+++ b/armsrc/appmain.h
@@ -13,7 +13,6 @@
 
 #include "common.h"
 
-extern const uint8_t OddByteParity[256];
 extern int rsamples;   // = 0;
 extern uint8_t trigger;
 extern bool allow_send_wtx;
diff --git a/armsrc/desfire_crypto.h b/armsrc/desfire_crypto.h
index 58588cd0d..f8a99a991 100644
--- a/armsrc/desfire_crypto.h
+++ b/armsrc/desfire_crypto.h
@@ -99,8 +99,6 @@ struct desfire_tag {
     uint32_t selected_application;
 };
 typedef struct desfire_tag *desfiretag_t;
-void crc32_ex(const uint8_t *data, const size_t len, uint8_t *crc);
-void crc32_append(uint8_t *data, const size_t len);
 void des_encrypt(void *out, const void *in, const void *key);
 void des_decrypt(void *out, const void *in, const void *key);
 void tdes_nxp_receive(const void *in, void *out, size_t length, const void *key, unsigned char iv[8], int keymode);
diff --git a/armsrc/mifarecmd.h b/armsrc/mifarecmd.h
index a4bf2b30b..df25521f9 100644
--- a/armsrc/mifarecmd.h
+++ b/armsrc/mifarecmd.h
@@ -52,7 +52,6 @@ void OnSuccessMagic();
 void OnErrorMagic(uint8_t reason);
 
 int32_t dist_nt(uint32_t nt1, uint32_t nt2);
-void ReaderMifare(bool first_try, uint8_t block, uint8_t keytype);
 //void RAMFUNC SniffMifare(uint8_t param);
 
 void Mifare_DES_Auth1(uint8_t arg0, uint8_t *datain);
diff --git a/armsrc/spiffs_config.h b/armsrc/spiffs_config.h
index 7710a65a8..0cf3b96f5 100644
--- a/armsrc/spiffs_config.h
+++ b/armsrc/spiffs_config.h
@@ -18,8 +18,6 @@
 #include "string.h"
 #include "flashmem.h"
 
-void Dbprintf(const char *fmt, ...);
-
 //#include <stddef.h>
 //#include <unistd.h>
 // ----------- >8 ------------