diff --git a/changes/2754.fix.md b/changes/2754.fix.md
new file mode 100644
index 0000000000..e7d6d77916
--- /dev/null
+++ b/changes/2754.fix.md
@@ -0,0 +1 @@
+Correct `msgpack` deserialization of `ResourceSlot`.
\ No newline at end of file
diff --git a/src/ai/backend/common/msgpack.py b/src/ai/backend/common/msgpack.py
index d8a2043ba3..9a435b8f4a 100644
--- a/src/ai/backend/common/msgpack.py
+++ b/src/ai/backend/common/msgpack.py
@@ -14,7 +14,7 @@
 import msgpack as _msgpack
 import temporenc
 
-from .types import BinarySize
+from .types import BinarySize, ResourceSlot
 
 __all__ = ("packb", "unpackb")
 
@@ -27,6 +27,7 @@ class ExtTypes(enum.IntEnum):
     POSIX_PATH = 4
     PURE_POSIX_PATH = 5
     ENUM = 6
+    RESOURCE_SLOT = 8
     BACKENDAI_BINARY_SIZE = 16
 
 
@@ -46,6 +47,8 @@ def _default(obj: object) -> Any:
             return _msgpack.ExtType(ExtTypes.POSIX_PATH, os.fsencode(obj))
         case PurePosixPath():
             return _msgpack.ExtType(ExtTypes.PURE_POSIX_PATH, os.fsencode(obj))
+        case ResourceSlot():
+            return _msgpack.ExtType(ExtTypes.RESOURCE_SLOT, pickle.dumps(obj, protocol=5))
         case enum.Enum():
             return _msgpack.ExtType(ExtTypes.ENUM, pickle.dumps(obj, protocol=5))
     raise TypeError(f"Unknown type: {obj!r} ({type(obj)})")
@@ -65,6 +68,8 @@ def _ext_hook(code: int, data: bytes) -> Any:
             return PurePosixPath(os.fsdecode(data))
         case ExtTypes.ENUM:
             return pickle.loads(data)
+        case ExtTypes.RESOURCE_SLOT:
+            return pickle.loads(data)
         case ExtTypes.BACKENDAI_BINARY_SIZE:
             return pickle.loads(data)
     return _msgpack.ExtType(code, data)
diff --git a/tests/common/test_msgpack.py b/tests/common/test_msgpack.py
index 3b4b811296..74ae3829c4 100644
--- a/tests/common/test_msgpack.py
+++ b/tests/common/test_msgpack.py
@@ -6,7 +6,7 @@
 from dateutil.tz import gettz, tzutc
 
 from ai.backend.common import msgpack
-from ai.backend.common.types import BinarySize, SlotTypes
+from ai.backend.common.types import BinarySize, ResourceSlot, SlotTypes
 
 
 def test_msgpack_with_unicode():
@@ -125,3 +125,20 @@ def test_msgpack_posixpath():
     unpacked = msgpack.unpackb(packed)
     assert isinstance(unpacked["path"], PosixPath)
     assert unpacked["path"] == path
+
+
+def test_msgpack_resource_slot():
+    resource_slot = ResourceSlot({"cpu": 1, "mem": 1024})
+    packed = msgpack.packb(resource_slot)
+    unpacked = msgpack.unpackb(packed)
+    assert unpacked == resource_slot
+
+    resource_slot = ResourceSlot({"cpu": 2, "mem": Decimal(1024**5)})
+    packed = msgpack.packb(resource_slot)
+    unpacked = msgpack.unpackb(packed)
+    assert unpacked == resource_slot
+
+    resource_slot = ResourceSlot({"cpu": 3, "mem": "1125899906842624"})
+    packed = msgpack.packb(resource_slot)
+    unpacked = msgpack.unpackb(packed)
+    assert unpacked == resource_slot