diff --git a/extmod/modopenamp.c b/extmod/modopenamp.c
index 7d5841c400..b5e813495b 100644
--- a/extmod/modopenamp.c
+++ b/extmod/modopenamp.c
@@ -80,11 +80,12 @@
 #define VRING_BUFF_ADDR         (METAL_SHM_ADDR + 0x2000)
 #define VRING_BUFF_SIZE         (METAL_SHM_SIZE - 0x2000)
 
-#if MICROPY_PY_OPENAMP_HOST
-static const char openamp_trace_buf[128];
+#if MICROPY_PY_OPENAMP_HOST && MICROPY_PY_OPENAMP_TRACE_BUF_ENABLE
+#ifndef MICROPY_PY_OPENAMP_TRACE_BUF
+static char openamp_trace_buf[MICROPY_PY_OPENAMP_TRACE_BUF_LEN];
 #define MICROPY_PY_OPENAMP_TRACE_BUF       ((uint32_t)openamp_trace_buf)
-#define MICROPY_PY_OPENAMP_TRACE_BUF_LEN   sizeof(MICROPY_PY_OPENAMP_TRACE_BUF)
-#endif // MICROPY_PY_OPENAMP_HOST
+#endif // MICROPY_PY_OPENAMP_TRACE_BUF
+#endif // MICROPY_PY_OPENAMP_HOST && MICROPY_PY_OPENAMP_TRACE_BUF_ENABLE
 
 #endif // MICROPY_PY_OPENAMP_RSC_TABLE_ENABLE
 
diff --git a/extmod/modopenamp.h b/extmod/modopenamp.h
index 8f677788f9..463399507b 100644
--- a/extmod/modopenamp.h
+++ b/extmod/modopenamp.h
@@ -47,6 +47,12 @@
 #define MICROPY_PY_OPENAMP_TRACE_BUF_ENABLE (1)
 #endif
 
+// Set the default trace buffer size, making it 128 bytes long unless
+// marked otherwise.
+#ifndef MICROPY_PY_OPENAMP_TRACE_BUF_LEN
+#define MICROPY_PY_OPENAMP_TRACE_BUF_LEN (128)
+#endif
+
 // For ports that don't define a custom image store, this enables a generic
 // VFS-based image store that supports loading elf files from storage.
 #ifndef MICROPY_PY_OPENAMP_REMOTEPROC_STORE_ENABLE