diff --git a/client/src/cmdhficlass.h b/client/src/cmdhficlass.h
index 1507d1d04..6fac5cee5 100644
--- a/client/src/cmdhficlass.h
+++ b/client/src/cmdhficlass.h
@@ -42,6 +42,5 @@ void picopass_elite_reset(void);
 uint32_t picopass_elite_rng(void);
 uint32_t picopass_elite_lcg(void);
 uint8_t picopass_elite_nextByte(void);
-void *generate_key_blocks(void *arg);
 void generate_key_block_inverted(const uint8_t *startingKey, uint64_t index, uint8_t *keyBlock);
 #endif