diff --git a/projects/daq1/zed/system_constr.xdc b/projects/daq1/zed/system_constr.xdc
index 5a69b03c6..15ccb9380 100644
--- a/projects/daq1/zed/system_constr.xdc
+++ b/projects/daq1/zed/system_constr.xdc
@@ -78,6 +78,6 @@ set_property  -dict {PACKAGE_PIN  K21  IOSTANDARD LVCMOS25} [get_ports spi_int]
 
 # clocks
 
-create_clock -name dac_clk_in   -period  2.00 [get_ports dac_clk_in_p]
-create_clock -name adc_clk_in   -period  2.00 [get_ports adc_clk_in_p]
+create_clock -name dac_clk_in   -period  2.222 [get_ports dac_clk_in_p]
+create_clock -name adc_clk_in   -period  2.222 [get_ports adc_clk_in_p]