diff --git a/drivers/ntosdrv/CMakeLists.txt b/drivers/ntosdrv/CMakeLists.txt
index 6552909..7abfae2 100644
--- a/drivers/ntosdrv/CMakeLists.txt
+++ b/drivers/ntosdrv/CMakeLists.txt
@@ -7,8 +7,8 @@ include_directories(
 
 # Specify list of source code files
 list(APPEND NTOSDRV_SOURCE
-    ${NTOSDRV_SOURCE_DIR}/ntosdrv.c
-    ${NTOSDRV_SOURCE_DIR}/rtl.c)
+    ${NTOSDRV_SOURCE_DIR}/ntosdrv.cc
+    ${NTOSDRV_SOURCE_DIR}/rtl.cc)
 
 # Set module definition SPEC file
 set_specfile(ntosdrv.spec ntosdrv.sys)
diff --git a/drivers/ntosdrv/ntosdrv.c b/drivers/ntosdrv/ntosdrv.cc
similarity index 89%
rename from drivers/ntosdrv/ntosdrv.c
rename to drivers/ntosdrv/ntosdrv.cc
index 5ed73d3..f646410 100644
--- a/drivers/ntosdrv/ntosdrv.c
+++ b/drivers/ntosdrv/ntosdrv.cc
@@ -1,7 +1,7 @@
 /**
  * PROJECT:         ExectOS
  * COPYRIGHT:       See COPYING.md in the top level directory
- * FILE:            drivers/ntosdrv/ntosdrv.c
+ * FILE:            drivers/ntosdrv/ntosdrv.cc
  * DESCRIPTION:     NTOS compatibility driver
  * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
  */
@@ -16,6 +16,7 @@
  *
  * @since XT 1.0
  */
+XTCLINK
 XTAPI
 XTSTATUS
 XtDriverEntry(VOID)
diff --git a/drivers/ntosdrv/rtl.c b/drivers/ntosdrv/rtl.cc
similarity index 94%
rename from drivers/ntosdrv/rtl.c
rename to drivers/ntosdrv/rtl.cc
index ab33304..43ef7a9 100644
--- a/drivers/ntosdrv/rtl.c
+++ b/drivers/ntosdrv/rtl.cc
@@ -1,7 +1,7 @@
 /**
  * PROJECT:         ExectOS
  * COPYRIGHT:       See COPYING.md in the top level directory
- * FILE:            drivers/ntosdrv/rtl.c
+ * FILE:            drivers/ntosdrv/rtl.cc
  * DESCRIPTION:     NTOS compatibility driver runtime library
  * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
  */
@@ -25,6 +25,7 @@
  *
  * @since NT 3.5
  */
+XTCLINK
 XTAPI
 VOID
 RtlFillMemory(OUT PVOID Destination,