diff --git a/src/libs/3rdparty/botan/botan.pri b/src/libs/3rdparty/botan/botan.pri
index 3c656766290..3ff57ded1ba 100644
--- a/src/libs/3rdparty/botan/botan.pri
+++ b/src/libs/3rdparty/botan/botan.pri
@@ -36,7 +36,7 @@ win32 {
 
     win32-msvc* {
         QMAKE_CXXFLAGS += -wd4251 -wd4290 -wd4250
-        DEFINES += BOTAN_BUILD_COMPILER_IS_MSVC BOTAN_TARGET_OS_HAS_GMTIME_S
+        DEFINES += BOTAN_BUILD_COMPILER_IS_MSVC BOTAN_TARGET_OS_HAS_GMTIME_S _SCL_SECURE_NO_WARNINGS
     } else {
         QMAKE_CFLAGS += -fpermissive -finline-functions -Wno-long-long
         QMAKE_CXXFLAGS += -fpermissive -finline-functions -Wno-long-long
diff --git a/src/libs/ssh/ssh.qbs b/src/libs/ssh/ssh.qbs
index d02a19eaee3..2b1949927ef 100644
--- a/src/libs/ssh/ssh.qbs
+++ b/src/libs/ssh/ssh.qbs
@@ -72,7 +72,9 @@ QtcLibrary {
         } else {
             result.push("BOTAN_DLL=")
             if (qbs.toolchain.contains("msvc"))
-                result.push("BOTAN_BUILD_COMPILER_IS_MSVC", "BOTAN_TARGET_OS_HAS_GMTIME_S")
+                result.push("BOTAN_BUILD_COMPILER_IS_MSVC",
+                            "BOTAN_TARGET_OS_HAS_GMTIME_S",
+                            "_SCL_SECURE_NO_WARNINGS")
             if (qbs.toolchain.contains("gcc") || qbs.toolchain.contains("mingw"))
                 result.push("BOTAN_BUILD_COMPILER_IS_GCC")
             if (qbs.targetOS.contains("linux"))
diff --git a/src/plugins/cpptools/cpptools.pro b/src/plugins/cpptools/cpptools.pro
index 79ba9bdb59d..b27d4f46fed 100644
--- a/src/plugins/cpptools/cpptools.pro
+++ b/src/plugins/cpptools/cpptools.pro
@@ -1,6 +1,7 @@
 include(../../qtcreatorplugin.pri)
 
 DEFINES += CPPTOOLS_LIBRARY
+win32-msvc*:DEFINES += _SCL_SECURE_NO_WARNINGS
 HEADERS += completionsettingspage.h \
     cppclassesfilter.h \
     cppcurrentdocumentfilter.h \
diff --git a/src/plugins/cpptools/cpptools.qbs b/src/plugins/cpptools/cpptools.qbs
index f810c63f0d6..e78d40ee199 100644
--- a/src/plugins/cpptools/cpptools.qbs
+++ b/src/plugins/cpptools/cpptools.qbs
@@ -15,6 +15,12 @@ QtcPlugin {
     Depends { name: "CPlusPlus" }
     Depends { name: "LanguageUtils" }
 
+    cpp.defines: base
+    Properties {
+        condition: qbs.toolchain.contains("msvc")
+        cpp.defines: base.concat("_SCL_SECURE_NO_WARNINGS")
+    }
+
     files: [
         "abstracteditorsupport.cpp",
         "abstracteditorsupport.h",