diff --git a/concrete/common/mlir/utils.py b/concrete/common/mlir/utils.py
index b6297eef8..406d034e6 100644
--- a/concrete/common/mlir/utils.py
+++ b/concrete/common/mlir/utils.py
@@ -71,6 +71,13 @@ def check_node_compatibility_with_mlir(
             return "only integer constants are supported"  # pragma: no cover
 
     elif isinstance(node, intermediate.GenericFunction):  # constraints for univariate functions
+        for inp in inputs:
+            if not value_is_integer(inp):
+                return (
+                    f"{node.op_name} with floating-point inputs "
+                    f"is required to be fused to be supported"
+                )
+
         if node.op_kind == "TLU":
             assert_true(
                 len(
@@ -90,9 +97,6 @@ def check_node_compatibility_with_mlir(
                 if node.op_name == "TLU":  # pragma: no cover
                     return "only unsigned integer lookup tables are supported"
 
-                if node.op_name.startswith("astype"):
-                    return f"{node.op_name} is not supported without fusing"
-
                 # e.g., `np.absolute is not supported for the time being`
                 return f"{node.op_name} is not supported for the time being"
         else:
diff --git a/tests/numpy/test_compile.py b/tests/numpy/test_compile.py
index c62c004f7..91ae343f5 100644
--- a/tests/numpy/test_compile.py
+++ b/tests/numpy/test_compile.py
@@ -1101,7 +1101,7 @@ function you are trying to compile isn't supported for MLIR lowering
 %8 = mul(%7, %0)                    # EncryptedScalar<float64>
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ only integer multiplication is supported
 %9 = astype(%8, dtype=int32)        # EncryptedScalar<int5>
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ astype is not supported without fusing
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ astype with floating-point inputs is required to be fused to be supported
 return %9
 
                 """.strip()  # noqa: E501