diff --git a/acinclude.m4 b/acinclude.m4
index ce9b43522e9..1a692b72f4a 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2238,8 +2238,8 @@ AC_DEFUN([PHP_SETUP_ICU],[
     PHP_EVAL_INCLINE($ICU_INCS)
     PHP_EVAL_LIBLINE($ICU_LIBS, $1)
 
-    ICU_EXTRA_FLAGS=`$ICU_CONFIG --cxxflags`
-    ICU_EXTRA_FLAGS="$ICU_EXTRA_FLAGS -DU_USING_ICU_NAMESPACE=1"
+    ICU_CXXFLAGS=`$ICU_CONFIG --cxxflags`
+    ICU_CXXFLAGS="$ICU_CXXFLAGS -DU_USING_ICU_NAMESPACE=1"
   fi
 ])
 
diff --git a/ext/intl/config.m4 b/ext/intl/config.m4
index 959ecd2b26a..e8428e1cbbe 100644
--- a/ext/intl/config.m4
+++ b/ext/intl/config.m4
@@ -88,7 +88,7 @@ if test "$PHP_INTL" != "no"; then
     breakiterator/rulebasedbreakiterator_methods.cpp \
     breakiterator/codepointiterator_internal.cpp \
     breakiterator/codepointiterator_methods.cpp"
-  PHP_INTL_CPP_FLAGS="$ICU_INCS -Wno-write-strings -D__STDC_LIMIT_MACROS -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 $ICU_EXTRA_FLAGS"
+  PHP_INTL_CPP_FLAGS="$ICU_INCS -Wno-write-strings -D__STDC_LIMIT_MACROS -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 $ICU_CXXFLAGS"
   if test "$ext_shared" = "no"; then
     PHP_ADD_SOURCES(PHP_EXT_DIR(intl), $PHP_INTL_CPP_SOURCES, $PHP_INTL_CPP_FLAGS)
   else