diff --git a/tools/icu/icu-generic.gyp b/tools/icu/icu-generic.gyp
index a50f12d7940bf7..2acc95b409b81d 100644
--- a/tools/icu/icu-generic.gyp
+++ b/tools/icu/icu-generic.gyp
@@ -32,7 +32,6 @@
       'direct_dependent_settings': {
         'defines': [
           'UCONFIG_NO_SERVICE=1',
-          'UCONFIG_NO_REGULAR_EXPRESSIONS=1',
           'U_ENABLE_DYLOAD=0',
           'U_STATIC_IMPLEMENTATION=1',
           'U_HAVE_STD_STRING=1',