diff --git a/src/utils.c b/src/utils.c
index 63d9230..fdda1c0 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -115,7 +115,7 @@ void amountToString(const uint8_t *amount,
                     uint8_t decimals,
                     const char *ticker,
                     char *out_buffer,
-                    uint8_t out_buffer_size) {
+                    size_t out_buffer_size) {
     char tmp_buffer[100] = {0};
 
     if (uint256_to_decimal(amount, amount_size, tmp_buffer, sizeof(tmp_buffer)) == false) {
diff --git a/src/utils.h b/src/utils.h
index 6ee5d45..be5ba3e 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -37,7 +37,7 @@ void amountToString(const uint8_t* amount,
                     uint8_t decimals,
                     const char* ticker,
                     char* out_buffer,
-                    uint8_t out_buffer_size);
+                    size_t out_buffer_size);
 
 bool parse_swap_config(uint8_t* config, uint8_t config_len, char* ticker, uint8_t* decimals);
 
diff --git a/src_common/ethUtils.c b/src_common/ethUtils.c
index d3c71b0..4239136 100644
--- a/src_common/ethUtils.c
+++ b/src_common/ethUtils.c
@@ -243,10 +243,10 @@ uint8_t *getNftContractAddress(const ethQueryContractUI_t *const msg) {
                          : msg->pluginSharedRO->txContent->destination);
 }
 
-bool adjustDecimals(char *src,
-                    uint32_t srcLength,
+bool adjustDecimals(const char *src,
+                    size_t srcLength,
                     char *target,
-                    uint32_t targetLength,
+                    size_t targetLength,
                     uint8_t decimals) {
     uint32_t startOffset;
     uint32_t lastZeroOffset = 0;
diff --git a/src_common/ethUtils.h b/src_common/ethUtils.h
index af88517..1099080 100644
--- a/src_common/ethUtils.h
+++ b/src_common/ethUtils.h
@@ -61,10 +61,10 @@ void getEthDisplayableAddress(uint8_t *in,
 
 uint8_t *getNftContractAddress(const ethQueryContractUI_t *const msg);
 
-bool adjustDecimals(char *src,
-                    uint32_t srcLength,
+bool adjustDecimals(const char *src,
+                    size_t srcLength,
                     char *target,
-                    uint32_t targetLength,
+                    size_t targetLength,
                     uint8_t decimals);
 
 static __attribute__((no_instrument_function)) inline int allzeroes(void *buf, size_t n) {