diff --git a/reactos/subsys/system/notepad/dialog.c b/reactos/subsys/system/notepad/dialog.c
index 3a6d260e8f2..53864d97b5e 100644
--- a/reactos/subsys/system/notepad/dialog.c
+++ b/reactos/subsys/system/notepad/dialog.c
@@ -23,6 +23,8 @@
 #define UNICODE
 #define _UNICODE
 
+#define _CRT_SECURE_NO_DEPRECATE
+
 #include <assert.h>
 #include <stdio.h>
 #include <windows.h>
diff --git a/reactos/subsys/system/notepad/main.c b/reactos/subsys/system/notepad/main.c
index 4e47566b59e..e7890ae9711 100644
--- a/reactos/subsys/system/notepad/main.c
+++ b/reactos/subsys/system/notepad/main.c
@@ -25,6 +25,8 @@
 #define UNICODE
 #define _UNICODE
 
+#define _CRT_SECURE_NO_DEPRECATE
+
 #include <windows.h>
 #include <stdio.h>
 #include <tchar.h>
diff --git a/reactos/subsys/system/taskmgr/precomp.h b/reactos/subsys/system/taskmgr/precomp.h
index d45339a4c06..ab9513301d8 100644
--- a/reactos/subsys/system/taskmgr/precomp.h
+++ b/reactos/subsys/system/taskmgr/precomp.h
@@ -1,3 +1,5 @@
+#define _CRT_SECURE_NO_DEPRECATE
+
 #define WIN32_NO_STATUS
 #include <windows.h>
 #define NTOS_MODE_USER