diff --git a/projects/imageon/zc706/system_constr.xdc b/projects/imageon/zc706/system_constr.xdc
index 9d024d35d..9b1b1257d 100644
--- a/projects/imageon/zc706/system_constr.xdc
+++ b/projects/imageon/zc706/system_constr.xdc
@@ -50,7 +50,7 @@ set_property  -dict {PACKAGE_PIN   AG15   IOSTANDARD LVCMOS25}    [get_ports  hd
 
 # clock definition
 
-create_clock -period 6.667  -name hdmi_rx_clk  [get_ports hdmi_rx_clk]
+create_clock -period 6.000  -name hdmi_rx_clk  [get_ports hdmi_rx_clk]
 
 # default constraints
 
diff --git a/projects/imageon/zed/system_constr.xdc b/projects/imageon/zed/system_constr.xdc
index 220b0da90..f483e514e 100644
--- a/projects/imageon/zed/system_constr.xdc
+++ b/projects/imageon/zed/system_constr.xdc
@@ -50,7 +50,7 @@ set_property  -dict {PACKAGE_PIN   N20    IOSTANDARD LVCMOS25}    [get_ports  hd
 
 # clock definition
 
-create_clock -period 6.667  -name hdmi_rx_clk  [get_ports hdmi_rx_clk]
+create_clock -period 6.000  -name hdmi_rx_clk  [get_ports hdmi_rx_clk]
 
 # i2s