diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf38581b1..d944e8bc6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Zowe Common C Changelog
 
+## `3.1.0`
+- Bugfix: removed "ByteOutputStream" debug message, which was part of the `zwe` command output (#4??)
+
 ## `3.0.0`
 - Feature: added javascript `zos.getStatvfs(path)` function to obtain file system information (#482).
 - Add support for LE 64-bit in isgenq.c (#422).
diff --git a/c/yaml2json.c b/c/yaml2json.c
index 9af3e5239..09331570a 100644
--- a/c/yaml2json.c
+++ b/c/yaml2json.c
@@ -731,8 +731,10 @@ ByteOutputStream *makeByteOutputStream(int chunkSize){
 int bosWrite(ByteOutputStream *bos, char *data, int dataSize){
   if (bos->size+dataSize > bos->capacity){
     int extendSize = (bos->chunkSize > dataSize) ? bos->chunkSize : dataSize;
+#ifdef NDEBUG
     printf("bos extend currSize=0x%x dataSize=0x%x chunk=0x%x extend=0x%x\n",
            bos->size,dataSize,bos->chunkSize,extendSize);
+#endif
     int newCapacity = bos->capacity + extendSize;
     char *newData = safeMalloc(newCapacity,"BOS extend");
     memcpy(newData,bos->data,bos->size);