diff --git a/src/sys/driver.c b/src/sys/driver.c
index 1106bcbe..4b6226a6 100644
--- a/src/sys/driver.c
+++ b/src/sys/driver.c
@@ -62,7 +62,7 @@ DriverEntry(
     DriverObject->MajorFunction[IRP_MJ_SET_QUOTA] = 0;
     DriverObject->MajorFunction[IRP_MJ_PNP] = 0;
 
-    /* setup fast I/O */
+    /* setup fast I/O and resource acquisition */
     static FAST_IO_DISPATCH FspFastIoDispatch = { 0 };
     FspFastIoDispatch.SizeOfFastIoDispatch = sizeof FspFastIoDispatch;
     FspFastIoDispatch.FastIoCheckIfPossible = FspFastIoCheckIfPossible;
diff --git a/src/sys/driver.h b/src/sys/driver.h
index dfb64f9f..74cf3f65 100644
--- a/src/sys/driver.h
+++ b/src/sys/driver.h
@@ -51,6 +51,6 @@ FAST_IO_ACQUIRE_FOR_CCFLUSH FspAcquireForCcFlush;
 FAST_IO_RELEASE_FOR_CCFLUSH FspReleaseForCcFlush;
 
 /* extern */
-PDEVICE_OBJECT FspDeviceObject;
+extern PDEVICE_OBJECT FspDeviceObject;
 
 #endif