diff --git a/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c b/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c
index c0ba02db40e..ffa176fc1ab 100644
--- a/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c
+++ b/reactos/dll/win32/dhcpcsvc/dhcp/adapter.c
@@ -147,7 +147,7 @@ cleanup:
 
 BOOL PrepareAdapterForService( PDHCP_ADAPTER Adapter ) {
     HKEY AdapterKey;
-    DWORD Error = ERROR_SUCCESS, DhcpEnabled, Length;
+    DWORD Error = ERROR_SUCCESS, DhcpEnabled, Length = sizeof(DWORD);
 
     Adapter->DhclientState.config = &Adapter->DhclientConfig;
     strncpy(Adapter->DhclientInfo.name, (char*)Adapter->IfMib.bDescr,