diff --git a/tangostationcontrol/tangostationcontrol/devices/sdp/sdp.py b/tangostationcontrol/tangostationcontrol/devices/sdp/sdp.py
index 0749755a1f08398131c1a10e61a65d9169cd2a84..ed970bc5681ec341a0bc62d0f37c82523f595f50 100644
--- a/tangostationcontrol/tangostationcontrol/devices/sdp/sdp.py
+++ b/tangostationcontrol/tangostationcontrol/devices/sdp/sdp.py
@@ -161,8 +161,8 @@ class SDP(opcua_device):
     FPGA_bsn_monitor_input_nof_valid_R = attribute_wrapper(comms_annotation=["FPGA_bsn_monitor_input_nof_valid_R"], datatype=numpy.int32, dims=(N_pn,))
     FPGA_bsn_monitor_input_nof_err_R = attribute_wrapper(comms_annotation=["FPGA_bsn_monitor_input_nof_err_R"], datatype=numpy.int32, dims=(N_pn,))
 
-    FPGA_signal_input_samples_delay_R = attribute_wrapper(comms_annotation=["FPGA_signal_input_samples_delay_R"], datatype=numpy.int32, dims=(S_pn, N_pn))
-    FPGA_signal_input_samples_delay_RW = attribute_wrapper(comms_annotation=["FPGA_signal_input_samples_delay_RW"], datatype=numpy.int32, dims=(S_pn, N_pn), access=AttrWriteType.READ_WRITE)
+    FPGA_signal_input_samples_delay_R = attribute_wrapper(comms_annotation=["FPGA_signal_input_samples_delay_R"], datatype=numpy.uint32, dims=(S_pn, N_pn))
+    FPGA_signal_input_samples_delay_RW = attribute_wrapper(comms_annotation=["FPGA_signal_input_samples_delay_RW"], datatype=numpy.uint32, dims=(S_pn, N_pn), access=AttrWriteType.READ_WRITE)
 
 
     # --------