diff --git a/projects/imageon_loopback/zed/system_constr.xdc b/projects/imageon_loopback/zed/system_constr.xdc
index f88b93c6f..999a2adb8 100644
--- a/projects/imageon_loopback/zed/system_constr.xdc
+++ b/projects/imageon_loopback/zed/system_constr.xdc
@@ -50,4 +50,6 @@ set_property -dict {PACKAGE_PIN N20 IOSTANDARD LVCMOS25} [get_ports hdmi_iic_rst
 
 set_property -dict {PACKAGE_PIN N19 IOSTANDARD LVCMOS25} [get_ports hdmiio_int] ; ## D08 FMC_LPC_LA01_CC_P
 
-set_property  -dict {IOB TRUE} [get_ports {hdmi_rx_data[*] hdmi_tx_data[*]}];
\ No newline at end of file
+set_property  -dict {IOB TRUE} [get_ports {hdmi_rx_data[*] hdmi_tx_data[*]}];
+
+create_clock -period 6.66667  -name hdmi_rx_clk  [get_ports hdmi_rx_clk]
\ No newline at end of file