diff --git a/acinclude.m4 b/acinclude.m4
index f9f6b08f567e4..e1e272fa24428 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2254,6 +2254,8 @@ AC_DEFUN([PHP_SETUP_ICU],[
       fi
     fi
   fi
+
+  ICU_CFLAGS="$ICU_CFLAGS -DU_DEFINE_FALSE_AND_TRUE=1"
 ])
 
 dnl