diff --git a/reactos/hal/halx86/amd64/halinit.c b/reactos/hal/halx86/amd64/halinit.c
index b9b305126d3..5d1a1f65db2 100644
--- a/reactos/hal/halx86/amd64/halinit.c
+++ b/reactos/hal/halx86/amd64/halinit.c
@@ -14,6 +14,8 @@
 
 /* GLOBALS *******************************************************************/
 
+BOOLEAN HalpPciLockSettings;
+
 /* PRIVATE FUNCTIONS *********************************************************/
 
 /* FUNCTIONS *****************************************************************/