diff --git a/.travis.yml b/.travis.yml
index 395c942f3..c434c2eb3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,27 +3,27 @@ matrix:
   include:
     - compiler: gcc
       os: linux
-      env: SWIGLANG=php VER=7.0 CONFIGOPTS=--enable-cpp11-testing CPPSTD=gnu++11
+      env: SWIGLANG=php VER=7.0 CONFIGOPTS=--enable-cpp11-testing CPPSTD=c++11
       dist: bionic
     - compiler: gcc
       os: linux
-      env: SWIGLANG=php VER=7.1 CONFIGOPTS=--enable-cpp11-testing CPPSTD=gnu++11
+      env: SWIGLANG=php VER=7.1 CONFIGOPTS=--enable-cpp11-testing CPPSTD=c++11
       dist: bionic
     - compiler: gcc
       os: linux
-      env: SWIGLANG=php VER=7.2 CONFIGOPTS=--enable-cpp11-testing CPPSTD=gnu++11
+      env: SWIGLANG=php VER=7.2 CONFIGOPTS=--enable-cpp11-testing CPPSTD=c++11
       dist: bionic
     - compiler: gcc
       os: linux
-      env: SWIGLANG=php VER=7.3 CONFIGOPTS=--enable-cpp11-testing CPPSTD=gnu++11
+      env: SWIGLANG=php VER=7.3 CONFIGOPTS=--enable-cpp11-testing CPPSTD=c++11
       dist: bionic
     - compiler: gcc
       os: linux
-      env: SWIGLANG=php VER=7.4 CONFIGOPTS=--enable-cpp11-testing CPPSTD=gnu++11
+      env: SWIGLANG=php VER=7.4 CONFIGOPTS=--enable-cpp11-testing CPPSTD=c++11
       dist: bionic
     - compiler: gcc
       os: linux
-      env: SWIGLANG=php VER=8.0 CONFIGOPTS=--enable-cpp11-testing CPPSTD=gnu++11
+      env: SWIGLANG=php VER=8.0 CONFIGOPTS=--enable-cpp11-testing CPPSTD=c++11
       dist: bionic
 
 before_install: