diff --git a/src/Common/Volumes.c b/src/Common/Volumes.c
index 53734abb..d3001a94 100644
--- a/src/Common/Volumes.c
+++ b/src/Common/Volumes.c
@@ -181,7 +181,7 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
 #if !defined(_UEFI)
 	TC_EVENT keyDerivationCompletedEvent;
 	TC_EVENT noOutstandingWorkItemEvent;
-	KeyDerivationWorkItem *keyDerivationWorkItems;
+	KeyDerivationWorkItem *keyDerivationWorkItems = NULL;
 	KeyDerivationWorkItem *item;
 	size_t encryptionThreadCount = GetEncryptionThreadCount();
 	LONG outstandingWorkItemCount = 0;
@@ -589,8 +589,11 @@ KeyReady:	;
 	{
 		TC_WAIT_EVENT (noOutstandingWorkItemEvent);
 
-		burn (keyDerivationWorkItems, sizeof (KeyDerivationWorkItem) * pkcs5PrfCount);
-		TCfree (keyDerivationWorkItems);
+		if (keyDerivationWorkItems)
+		{
+			burn (keyDerivationWorkItems, sizeof (KeyDerivationWorkItem) * pkcs5PrfCount);
+			TCfree (keyDerivationWorkItems);
+		}
 
 #if !defined(DEVICE_DRIVER) 
 		CloseHandle (keyDerivationCompletedEvent);
diff --git a/src/Driver/DriveFilter.c b/src/Driver/DriveFilter.c
index a12b1ec0..dc836ebe 100644
--- a/src/Driver/DriveFilter.c
+++ b/src/Driver/DriveFilter.c
@@ -220,7 +220,7 @@ NTSTATUS LoadBootArguments (BOOL bIsEfi)
 
 NTSTATUS DriveFilterAddDevice (PDRIVER_OBJECT driverObject, PDEVICE_OBJECT pdo)
 {
-	DriveFilterExtension *Extension;
+	DriveFilterExtension *Extension = NULL;
 	NTSTATUS status;
 	PDEVICE_OBJECT filterDeviceObject = NULL;
 	PDEVICE_OBJECT attachedDeviceObject;
@@ -275,7 +275,7 @@ NTSTATUS DriveFilterAddDevice (PDRIVER_OBJECT driverObject, PDEVICE_OBJECT pdo)
 err:
 	if (filterDeviceObject)
 	{
-		if (Extension->LowerDeviceObject)
+		if (Extension && Extension->LowerDeviceObject)
 			IoDetachDevice (Extension->LowerDeviceObject);
 
 		IoDeleteDevice (filterDeviceObject);
diff --git a/src/Driver/Ntdriver.c b/src/Driver/Ntdriver.c
index a05335f2..a5ef2472 100644
--- a/src/Driver/Ntdriver.c
+++ b/src/Driver/Ntdriver.c
@@ -13,6 +13,8 @@
 
 #include "TCdefs.h"
 #include <ntddk.h>
+#include <initguid.h>
+#include <Ntddstor.h>
 #include "Crypto.h"
 #include "Fat.h"
 #include "Tests.h"
diff --git a/src/Driver/Ntvol.c b/src/Driver/Ntvol.c
index f9e11d3d..747fc026 100644
--- a/src/Driver/Ntvol.c
+++ b/src/Driver/Ntvol.c
@@ -43,14 +43,14 @@ NTSTATUS TCOpenVolume (PDEVICE_OBJECT DeviceObject,
 	       PWSTR pwszMountVolume,
 	       BOOL bRawDevice)
 {
-	FILE_STANDARD_INFORMATION FileStandardInfo;
+	FILE_STANDARD_INFORMATION FileStandardInfo = {0};
 	FILE_BASIC_INFORMATION FileBasicInfo;
 	OBJECT_ATTRIBUTES oaFileAttributes;
 	UNICODE_STRING FullFileName;
 	IO_STATUS_BLOCK IoStatusBlock;
 	PCRYPTO_INFO cryptoInfoPtr = NULL;
 	PCRYPTO_INFO tmpCryptoInfo = NULL;
-	LARGE_INTEGER lDiskLength;
+	LARGE_INTEGER lDiskLength = {0};
 	__int64 partitionStartingOffset = 0;
 	int volumeType;
 	char *readBuffer = 0;
diff --git a/src/Driver/VolumeFilter.c b/src/Driver/VolumeFilter.c
index a3d323be..14e496bc 100644
--- a/src/Driver/VolumeFilter.c
+++ b/src/Driver/VolumeFilter.c
@@ -25,7 +25,7 @@ uint32 HiddenSysLeakProtectionCount = 0;
 
 NTSTATUS VolumeFilterAddDevice (PDRIVER_OBJECT driverObject, PDEVICE_OBJECT pdo)
 {
-	VolumeFilterExtension *Extension;
+	VolumeFilterExtension *Extension = NULL;
 	NTSTATUS status;
 	PDEVICE_OBJECT filterDeviceObject = NULL;
 	PDEVICE_OBJECT attachedDeviceObject;
@@ -72,7 +72,7 @@ NTSTATUS VolumeFilterAddDevice (PDRIVER_OBJECT driverObject, PDEVICE_OBJECT pdo)
 err:
 	if (filterDeviceObject)
 	{
-		if (Extension->LowerDeviceObject)
+		if (Extension && Extension->LowerDeviceObject)
 			IoDetachDevice (Extension->LowerDeviceObject);
 
 		IoDeleteDevice (filterDeviceObject);