diff --git a/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utdelete.c b/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utdelete.c
index 2cf71aee3a..78efdb2020 100644
--- a/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utdelete.c
+++ b/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utdelete.c
@@ -293,7 +293,7 @@ AcpiUtDeleteInternalObj (
             /* Global Lock has extra semaphore */
 
             (void) AcpiOsDeleteSemaphore (AcpiGbl_GlobalLockSemaphore);
-            AcpiGbl_GlobalLockSemaphore = NULL;
+            AcpiGbl_GlobalLockSemaphore = -1;
 
             AcpiOsDeleteMutex (Object->Mutex.OsMutex);
             AcpiGbl_GlobalLockMutex = NULL;
@@ -312,7 +312,7 @@ AcpiUtDeleteInternalObj (
             Object, Object->Event.OsSemaphore));
 
         (void) AcpiOsDeleteSemaphore (Object->Event.OsSemaphore);
-        Object->Event.OsSemaphore = NULL;
+        Object->Event.OsSemaphore = -1;
         break;
 
     case ACPI_TYPE_METHOD:
diff --git a/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utinit.c b/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utinit.c
index 27f1e37b83..cba117d6d7 100644
--- a/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utinit.c
+++ b/src/add-ons/kernel/bus_managers/acpi/acpica/components/utilities/utinit.c
@@ -316,7 +316,7 @@ AcpiUtInitGlobals (
 
     /* Global Lock support */
 
-    AcpiGbl_GlobalLockSemaphore         = NULL;
+    AcpiGbl_GlobalLockSemaphore         = -1;
     AcpiGbl_GlobalLockMutex             = NULL;
     AcpiGbl_GlobalLockAcquired          = FALSE;
     AcpiGbl_GlobalLockHandle            = 0;