diff --git a/tools/gdb/nuttxgdb/utils.py b/tools/gdb/nuttxgdb/utils.py
index 3a97a23330..144282d3a3 100644
--- a/tools/gdb/nuttxgdb/utils.py
+++ b/tools/gdb/nuttxgdb/utils.py
@@ -339,6 +339,12 @@ def nitems(array):
     return array_size
 
 
+def sizeof(t: Union[str, gdb.Type]):
+    if type(t) is str:
+        t = gdb.lookup_type(t)
+
+    return t.sizeof
+
 # Machine Specific Helper Functions