diff --git a/src/add-ons/kernel/bus_managers/acpi/ACPICAHaiku.cpp b/src/add-ons/kernel/bus_managers/acpi/ACPICAHaiku.cpp
index 3aad4e020e..dda946e3bf 100644
--- a/src/add-ons/kernel/bus_managers/acpi/ACPICAHaiku.cpp
+++ b/src/add-ons/kernel/bus_managers/acpi/ACPICAHaiku.cpp
@@ -1298,9 +1298,11 @@ AcpiOsAcquireMutex(ACPI_MUTEX handle, UINT16 timeout)
 	ACPI_STATUS result = AE_OK;
 	DEBUG_FUNCTION_VF("mutex: %p; timeout: %u", handle, timeout);
 
-	if (timeout == ACPI_WAIT_FOREVER)
-		result = mutex_lock(handle) == B_OK ? AE_OK : AE_BAD_PARAMETER;
-	else {
+	if (timeout == ACPI_WAIT_FOREVER) {
+		result = (mutex_lock(handle) == B_OK) ? AE_OK : AE_BAD_PARAMETER;
+	} else if (timeout == ACPI_DO_NOT_WAIT) {
+		result = (mutex_trylock(handle) == B_OK) ? AE_OK : AE_TIME;
+	} else {
 		switch (mutex_lock_with_timeout(handle, B_RELATIVE_TIMEOUT,
 			(bigtime_t)timeout * 1000)) {
 			case B_OK: