diff --git a/crates/stdlib/src/mmap.rs b/crates/stdlib/src/mmap.rs
index 2a07cf7d8..312d35a4e 100644
--- a/crates/stdlib/src/mmap.rs
+++ b/crates/stdlib/src/mmap.rs
@@ -1141,6 +1141,11 @@ mod mmap {
             self.pos()
         }
 
+        #[pymethod]
+        fn seekable(&self) -> bool {
+            true
+        }
+
         #[pymethod]
         fn write(&self, bytes: ArgBytesLike, vm: &VirtualMachine) -> PyResult<PyIntRef> {
             let pos = self.pos();
diff --git a/extra_tests/snippets/stdlib_mmap.py b/extra_tests/snippets/stdlib_mmap.py
new file mode 100644
index 000000000..3a2b139a3
--- /dev/null
+++ b/extra_tests/snippets/stdlib_mmap.py
@@ -0,0 +1,6 @@
+import mmap
+
+mapped = mmap.mmap(-1, 1)
+assert mapped.seekable()
+mapped.close()
+assert mapped.seekable()