diff --git a/include/net/buf.h b/include/net/buf.h
index 387b516195b..5eb6163fe71 100644
--- a/include/net/buf.h
+++ b/include/net/buf.h
@@ -1088,15 +1088,15 @@ extern const struct net_buf_data_alloc net_buf_heap_alloc;
  *
  * @param _name      Name of the pool variable.
  * @param _count     Number of buffers in the pool.
+ * @param _ud_size   User data space to reserve per buffer.
  * @param _destroy   Optional destroy callback when buffer is freed.
  */
-#define NET_BUF_POOL_HEAP_DEFINE(_name, _count, _destroy)                     \
-	_NET_BUF_ARRAY_DEFINE(_name, _count, CONFIG_NET_BUF_USER_DATA_SIZE);  \
-	static struct net_buf_pool _name __net_buf_align                      \
-			__in_section(_net_buf_pool, static, _name) =          \
-		NET_BUF_POOL_INITIALIZER(_name, &net_buf_heap_alloc,          \
-					 _net_buf_##_name, _count,            \
-					 CONFIG_NET_BUF_USER_DATA_SIZE,       \
+#define NET_BUF_POOL_HEAP_DEFINE(_name, _count, _ud_size, _destroy)          \
+	_NET_BUF_ARRAY_DEFINE(_name, _count, _ud_size);                      \
+	static struct net_buf_pool _name __net_buf_align                     \
+			__in_section(_net_buf_pool, static, _name) =         \
+		NET_BUF_POOL_INITIALIZER(_name, &net_buf_heap_alloc,         \
+					 _net_buf_##_name, _count, _ud_size, \
 					 _destroy)
 
 struct net_buf_pool_fixed {
diff --git a/tests/net/buf/src/main.c b/tests/net/buf/src/main.c
index 03d4a8b841d..274b4403224 100644
--- a/tests/net/buf/src/main.c
+++ b/tests/net/buf/src/main.c
@@ -63,7 +63,7 @@ static void buf_destroy(struct net_buf *buf);
 static void fixed_destroy(struct net_buf *buf);
 static void var_destroy(struct net_buf *buf);
 
-NET_BUF_POOL_HEAP_DEFINE(bufs_pool, 10, buf_destroy);
+NET_BUF_POOL_HEAP_DEFINE(bufs_pool, 10, 0, buf_destroy);
 NET_BUF_POOL_FIXED_DEFINE(fixed_pool, 10, 128, fixed_destroy);
 NET_BUF_POOL_VAR_DEFINE(var_pool, 10, 1024, 0, var_destroy);