diff --git a/development/scons/SConstruct b/development/scons/SConstruct
index 74db7429b7..6639fdda6f 100644
--- a/development/scons/SConstruct
+++ b/development/scons/SConstruct
@@ -448,11 +448,10 @@ C_COMPILER = env.subst('$CC')
 C_CCFLAGS = env.subst('$CCFLAGS').split()
 # if we use ms vc, the commands are fine (cl.exe and link.exe)
 if use_vc:
-    # /TP treat all source code as C++
     # C4819: The file contains a character that cannot be represented
     #   in the current code page (number)
     # C4996: foo was decleared deprecated
-    CCFLAGS_required.extend(['/TP', '/EHsc'])
+    CCFLAGS_required.append('/EHsc')
     if mode == 'debug':
         CCFLAGS_default.extend(['/wd4819', '/wd4996', '/nologo', '/MDd'])
         # the flags are also needed in C mode (for intl lib)
diff --git a/development/scons/scons_utils.py b/development/scons/scons_utils.py
index 9fa18265c4..4749bf882e 100644
--- a/development/scons/scons_utils.py
+++ b/development/scons/scons_utils.py
@@ -236,7 +236,8 @@ int main()
 }
 '''
     conf.Message('Checking for the use of global cstd... ')
-    ret = conf.TryLink(check_global_cstd_source, '.c')
+    # if can not compile, define CXX_GLOBAL_CSTD
+    ret = not conf.TryLink(check_global_cstd_source, '.c')
     conf.Result(ret)
     return ret