diff --git a/src/monero_api.h b/src/monero_api.h
index e2584c4..195cac4 100644
--- a/src/monero_api.h
+++ b/src/monero_api.h
@@ -113,7 +113,7 @@ int monero_vamount2str(unsigned char *binary, char *str, unsigned int str_len);
 /** binary little endian unsigned  int amount to str */
 int monero_bamount2str(unsigned char *binary, char *str, size_t binary_len, unsigned int str_len);
 /** uint64  amount to str */
-int monero_amount2str(uint64_t xmr, char *str, unsigned int str_len);
+unsigned int monero_amount2str(uint64_t xmr, char *str, unsigned int str_len);
 
 /** uint64  amount to str */
 unsigned int monero_uint642str(uint64_t val, char *str, unsigned int str_len);
diff --git a/src/monero_crypto.c b/src/monero_crypto.c
index ee41a97..05155fc 100644
--- a/src/monero_crypto.c
+++ b/src/monero_crypto.c
@@ -1284,7 +1284,6 @@ int monero_rng_mod_order(unsigned char *r, size_t r_len) {
 /* ----------------------------------------------------------------------- */
 /* ---                                                                 --- */
 /* ----------------------------------------------------------------------- */
-/* return 0 if ok, 1 if missing decimal */
 unsigned int monero_uint642str(uint64_t val, char *str, unsigned int str_len) {
     char stramount[22];
     unsigned int offset, len;
@@ -1312,8 +1311,7 @@ unsigned int monero_uint642str(uint64_t val, char *str, unsigned int str_len) {
 /* ----------------------------------------------------------------------- */
 /* ---                                                                 --- */
 /* ----------------------------------------------------------------------- */
-/* return 0 if ok, 1 if missing decimal */
-int monero_amount2str(uint64_t xmr, char *str, unsigned int str_len) {
+unsigned int monero_amount2str(uint64_t xmr, char *str, unsigned int str_len) {
     // max uint64 is 18446744073709551616, aka 20 char, plus dot
     char stramount[22];
     unsigned int offset, len;