diff --git a/libpcp/util.c b/libpcp/util.c
index f3e502a..11f9302 100644
--- a/libpcp/util.c
+++ b/libpcp/util.c
@@ -95,7 +95,7 @@ size_t _hex2bin(const char *hex_str, unsigned char *byte_array, size_t byte_arra
     if (byte_array_size > byte_array_max)
     {
         // Too big for the output array
-        return -1;
+        return 0;
     }
 
     if (hex_str_len % 2 == 1)
@@ -103,7 +103,7 @@ size_t _hex2bin(const char *hex_str, unsigned char *byte_array, size_t byte_arra
         // hex_str is an odd length, so assume an implicit "0" prefix
         if (sscanf(&(hex_str[0]), "%1hhx", &(byte_array[0])) != 1)
         {
-            return -1;
+            return 0;
         }
 
         i = j = 1;
@@ -113,7 +113,7 @@ size_t _hex2bin(const char *hex_str, unsigned char *byte_array, size_t byte_arra
     {
         if (sscanf(&(hex_str[i]), "%2hhx", &(byte_array[j])) != 1)
         {
-            return -1;
+            return 0;
         }
     }