diff --git a/bacnet-stack/demo/handler/h_arf.c b/bacnet-stack/demo/handler/h_arf.c
index 36278bef..b51e710a 100644
--- a/bacnet-stack/demo/handler/h_arf.c
+++ b/bacnet-stack/demo/handler/h_arf.c
@@ -170,7 +170,7 @@ void handler_atomic_read_file(
                     service_data->invoke_id,
                     ABORT_REASON_SEGMENTATION_NOT_SUPPORTED, true);
 #if PRINT_ENABLED
-                fprintf(stderr, "Too Big To Send (%d >= %zu). Sending Abort!\n",
+                fprintf(stderr, "Too Big To Send (%d >= %d). Sending Abort!\n",
                     data.type.stream.requestedOctetCount,
                     octetstring_capacity(&data.fileData));
 #endif
diff --git a/bacnet-stack/demo/handler/h_awf.c b/bacnet-stack/demo/handler/h_awf.c
index 156bae0a..28c94c94 100644
--- a/bacnet-stack/demo/handler/h_awf.c
+++ b/bacnet-stack/demo/handler/h_awf.c
@@ -128,7 +128,7 @@ void handler_atomic_write_file(
         } else if (data.access == FILE_STREAM_ACCESS) {
             if (bacfile_write_stream_data(&data)) {
 #if PRINT_ENABLED
-                fprintf(stderr, "AWF: Stream offset %d, %zu bytes\n",
+                fprintf(stderr, "AWF: Stream offset %d, %d bytes\n",
                     data.type.stream.fileStartPosition,
                     octetstring_length(&data.fileData));
 #endif
diff --git a/bacnet-stack/demo/readfile/main.c b/bacnet-stack/demo/readfile/main.c
index 4c27f4b7..7b4dbbfd 100644
--- a/bacnet-stack/demo/readfile/main.c
+++ b/bacnet-stack/demo/readfile/main.c
@@ -144,7 +144,7 @@ static void AtomicReadFileAckHandler(
                 } else if (octets_written == 0) {
                     fprintf(stderr, "Received 0 byte octet string!.\n");
                 } else {
-                    printf("\r%zu bytes",
+                    printf("\r%d bytes",
                         (data.type.stream.fileStartPosition + octets_written));
                 }
                 fflush(pFile);
diff --git a/bacnet-stack/demo/writefile/main.c b/bacnet-stack/demo/writefile/main.c
index 8e70676c..fd2c69c2 100644
--- a/bacnet-stack/demo/writefile/main.c
+++ b/bacnet-stack/demo/writefile/main.c
@@ -279,7 +279,7 @@ int main(
                     fclose(pFile);
                 } else
                     End_Of_File_Detected = true;
-                printf("\rSending %zu bytes", (fileStartPosition + len));
+                printf("\rSending %d bytes", (fileStartPosition + len));
                 invoke_id =
                     Send_Atomic_Write_File_Stream
                     (Target_Device_Object_Instance,