diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index eb04be431..ea1ad6050 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -2397,7 +2397,6 @@ def mk_config():
         return
     config = open(os.path.join(BUILD_DIR, 'config.mk'), 'w')
     global CXX, CC, GMP, GUARD_CF, STATIC_BIN, GIT_HASH, CPPFLAGS, CXXFLAGS, LDFLAGS, EXAMP_DEBUG_FLAG, FPMATH_FLAGS, LOG_SYNC, SINGLE_THREADED
-    CXXFLAGS = '%s -std=c++17' % CXXFLAGS
     if IS_WINDOWS:
         config.write(
             'CC=cl\n'
@@ -2514,6 +2513,7 @@ def mk_config():
             CPPFLAGS = '%s -D_MP_INTERNAL' % CPPFLAGS
         if GIT_HASH:
             CPPFLAGS = '%s -DZ3GITHASH=%s' % (CPPFLAGS, GIT_HASH)
+        CXXFLAGS = '%s -std=c++17' % CXXFLAGS
         CXXFLAGS = '%s -fvisibility=hidden -c' % CXXFLAGS
         FPMATH = test_fpmath(CXX)
         CXXFLAGS = '%s %s' % (CXXFLAGS, FPMATH_FLAGS)