diff --git a/lib/ykpiv.c b/lib/ykpiv.c
index 6e318e5..da4fa44 100644
--- a/lib/ykpiv.c
+++ b/lib/ykpiv.c
@@ -782,7 +782,7 @@ ykpiv_rc ykpiv_verify(ykpiv_state *state, const char *pin, int *tries) {
 #define CHREF_ACT_UNBLOCK_PIN 1
 #define CHREF_ACT_CHANGE_PUK 2
 
-static ykpiv_rc _change_pin_internal(ykpiv_state *state, int action, const char * current_pin, size_t current_pin_len, const char * new_pin, size_t new_pin_len, int *tries) {
+static ykpiv_rc change_pin_internal(ykpiv_state *state, int action, const char * current_pin, size_t current_pin_len, const char * new_pin, size_t new_pin_len, int *tries) {
   int sw;
   unsigned char templ[] = {0, YKPIV_INS_CHANGE_REFERENCE, 0, 0x80};
   unsigned char indata[0x10];
@@ -829,7 +829,7 @@ static ykpiv_rc _change_pin_internal(ykpiv_state *state, int action, const char
 }
 
 ykpiv_rc ykpiv_change_pin(ykpiv_state *state, const char * current_pin, size_t current_pin_len, const char * new_pin, size_t new_pin_len, int *tries) {
-  ykpiv_rc res = _change_pin_internal(state, CHREF_ACT_CHANGE_PIN, current_pin, current_pin_len, new_pin, new_pin_len, tries);
+  ykpiv_rc res = change_pin_internal(state, CHREF_ACT_CHANGE_PIN, current_pin, current_pin_len, new_pin, new_pin_len, tries);
   if (res == YKPIV_OK && new_pin != NULL) {
     free(state->pin);
     state->pin = malloc(new_pin_len * sizeof(char) + 1);
@@ -842,11 +842,11 @@ ykpiv_rc ykpiv_change_pin(ykpiv_state *state, const char * current_pin, size_t c
 }
 
 ykpiv_rc ykpiv_change_puk(ykpiv_state *state, const char * current_puk, size_t current_puk_len, const char * new_puk, size_t new_puk_len, int *tries) {
-  return _change_pin_internal(state, CHREF_ACT_CHANGE_PUK, current_puk, current_puk_len, new_puk, new_puk_len, tries);
+  return change_pin_internal(state, CHREF_ACT_CHANGE_PUK, current_puk, current_puk_len, new_puk, new_puk_len, tries);
 }
 
 ykpiv_rc ykpiv_unblock_pin(ykpiv_state *state, const char * puk, size_t puk_len, const char * new_pin, size_t new_pin_len, int *tries) {
-  return _change_pin_internal(state, CHREF_ACT_UNBLOCK_PIN, puk, puk_len, new_pin, new_pin_len, tries);
+  return change_pin_internal(state, CHREF_ACT_UNBLOCK_PIN, puk, puk_len, new_pin, new_pin_len, tries);
 }
 
 ykpiv_rc ykpiv_fetch_object(ykpiv_state *state, int object_id,