diff -r b686d0c98c62 -r 70885c3d15b0 src/utils.c
--- a/src/utils.c	Fri Jul 07 17:46:00 2023 +0200
+++ b/src/utils.c	Fri Jul 07 17:51:54 2023 +0200
@@ -28,8 +28,13 @@
 
 #include "cx/utils.h"
 
+#ifndef CX_STREAM_BCOPY_BUF_SIZE
 #define CX_STREAM_BCOPY_BUF_SIZE 8192
+#endif
+
+#ifndef CX_STREAM_COPY_BUF_SIZE
 #define CX_STREAM_COPY_BUF_SIZE 1024
+#endif
 
 size_t cx_stream_bncopy(
         void *src,