diff --git a/sys/dev/dc/if_dcreg.h b/sys/dev/dc/if_dcreg.h
index b9c38680bc6..bfbed27aec5 100644
--- a/sys/dev/dc/if_dcreg.h
+++ b/sys/dev/dc/if_dcreg.h
@@ -341,6 +341,7 @@
 #define DC_WDOG_RXWDOGDIS	0x00000010
 #define DC_WDOG_RXWDOGCLK	0x00000020
 #define DC_WDOG_MUSTBEZERO	0x00000100
+#define DC_WDOG_CTLWREN		0x08000000
 
 /*
  * Size of a setup frame.
diff --git a/sys/pci/if_dcreg.h b/sys/pci/if_dcreg.h
index b9c38680bc6..bfbed27aec5 100644
--- a/sys/pci/if_dcreg.h
+++ b/sys/pci/if_dcreg.h
@@ -341,6 +341,7 @@
 #define DC_WDOG_RXWDOGDIS	0x00000010
 #define DC_WDOG_RXWDOGCLK	0x00000020
 #define DC_WDOG_MUSTBEZERO	0x00000100
+#define DC_WDOG_CTLWREN		0x08000000
 
 /*
  * Size of a setup frame.