diff --git a/concrete/numpy/compilation/circuit.py b/concrete/numpy/compilation/circuit.py
index 3cdd68317..aff8f481f 100644
--- a/concrete/numpy/compilation/circuit.py
+++ b/concrete/numpy/compilation/circuit.py
@@ -39,6 +39,13 @@ class Circuit:
             assert_that(self.configuration.enable_unsafe_features)
             return
 
+        input_signs = []
+        for i in range(len(graph.input_nodes)):  # pylint: disable=consider-using-enumerate
+            input_value = graph.input_nodes[i].output
+            assert_that(isinstance(input_value.dtype, Integer))
+            input_dtype = cast(Integer, input_value.dtype)
+            input_signs.append(input_dtype.is_signed)
+
         output_signs = []
         for i in range(len(graph.output_nodes)):  # pylint: disable=consider-using-enumerate
             output_value = graph.output_nodes[i].output
@@ -46,7 +53,7 @@ class Circuit:
             output_dtype = cast(Integer, output_value.dtype)
             output_signs.append(output_dtype.is_signed)
 
-        self.server = Server.create(mlir, output_signs, self.configuration)
+        self.server = Server.create(mlir, input_signs, output_signs, self.configuration)
 
         keyset_cache_directory = None
         if self.configuration.use_insecure_key_cache:
diff --git a/concrete/numpy/compilation/server.py b/concrete/numpy/compilation/server.py
index 740b51128..f9f7ca1cd 100644
--- a/concrete/numpy/compilation/server.py
+++ b/concrete/numpy/compilation/server.py
@@ -58,7 +58,12 @@ class Server:
         )
 
     @staticmethod
-    def create(mlir: str, output_signs: List[bool], configuration: Configuration) -> "Server":
+    def create(
+        mlir: str,
+        input_signs: List[bool],
+        output_signs: List[bool],
+        configuration: Configuration,
+    ) -> "Server":
         """
         Create a server using MLIR and output sign information.
 
@@ -66,6 +71,9 @@ class Server:
             mlir (str):
                 mlir to compile
 
+            input_signs (List[bool]):
+                sign status of the inputs
+
             output_signs (List[bool]):
                 sign status of the outputs
 
@@ -101,7 +109,8 @@ class Server:
             compilation_result = support.compile(mlir, options)
             server_lambda = support.load_server_lambda(compilation_result)
 
-        client_specs = ClientSpecs(support.load_client_parameters(compilation_result), output_signs)
+        client_parameters = support.load_client_parameters(compilation_result)
+        client_specs = ClientSpecs(input_signs, client_parameters, output_signs)
         return Server(client_specs, output_dir, support, compilation_result, server_lambda)
 
     def save(self, path: Union[str, Path]):
diff --git a/concrete/numpy/compilation/specs.py b/concrete/numpy/compilation/specs.py
index 12c26a0bf..1d0c4f54d 100644
--- a/concrete/numpy/compilation/specs.py
+++ b/concrete/numpy/compilation/specs.py
@@ -13,10 +13,17 @@ class ClientSpecs:
     ClientSpecs class, to create Client objects.
     """
 
+    input_signs: List[bool]
     client_parameters: ClientParameters
     output_signs: List[bool]
 
-    def __init__(self, client_parameters: ClientParameters, output_signs: List[bool]):
+    def __init__(
+        self,
+        input_signs: List[bool],
+        client_parameters: ClientParameters,
+        output_signs: List[bool],
+    ):
+        self.input_signs = input_signs
         self.client_parameters = client_parameters
         self.output_signs = output_signs
 
@@ -32,6 +39,7 @@ class ClientSpecs:
         client_parameters_json = json.loads(self.client_parameters.serialize())
         return json.dumps(
             {
+                "input_signs": self.input_signs,
                 "client_parameters": client_parameters_json,
                 "output_signs": self.output_signs,
             }
@@ -56,7 +64,7 @@ class ClientSpecs:
         client_parameters_bytes = json.dumps(raw_specs["client_parameters"]).encode("utf-8")
         client_parameters = ClientParameters.unserialize(client_parameters_bytes)
 
-        return ClientSpecs(client_parameters, raw_specs["output_signs"])
+        return ClientSpecs(raw_specs["input_signs"], client_parameters, raw_specs["output_signs"])
 
     def serialize_public_args(self, args: PublicArguments) -> bytes:  # pylint: disable=no-self-use
         """