diff --git a/include/osmocom/gsm/comp128v23.h b/include/osmocom/gsm/comp128v23.h
index aa26e56..bebeb59 100644
--- a/include/osmocom/gsm/comp128v23.h
+++ b/include/osmocom/gsm/comp128v23.h
@@ -13,11 +13,11 @@
  * Performs the COMP128 version 2 and 3 algorithm (used as A3/A8)
  * ki    : uint8_t [16]
  * srand : uint8_t [16]
- * version : uint8_t (2 or 3)
  * sres  : uint8_t [4]
  * kc    : uint8_t [8]
  * returns 1 if not version 2 or 3 specified
  */
-int comp128v23(const uint8_t *ki, const uint8_t *rand, uint8_t version, uint8_t *sres, uint8_t *kc);
+int comp128v2(const uint8_t *ki, const uint8_t *rand, uint8_t *sres, uint8_t *kc);
+int comp128v3(const uint8_t *ki, const uint8_t *rand, uint8_t *sres, uint8_t *kc);
 
 #endif /* __COMP128V23_H__ */