diff --git a/docker-test.sh b/docker-test.sh
index 8cc8c093..00cc63b3 100644
--- a/docker-test.sh
+++ b/docker-test.sh
@@ -1,4 +1,4 @@
-export NPROCS=1 && export JOBS=1 && export CXX=g++-4.9 && export PGUSER=postgres
+export NPROCS=1 && export JOBS=1 && export CXX=g++-4.9 && export PGUSER=postgres export POSTGIS_VERSION=2.4
 
 npm install -g yarn@0.27.5
 yarn
@@ -8,4 +8,4 @@ yarn
 createdb template_postgis && createuser publicuser
 psql -c "CREATE EXTENSION postgis" template_postgis
 
-POSTGIS_VERSION=2.4 npm test
\ No newline at end of file
+npm test
\ No newline at end of file
diff --git a/test/acceptance/buffer-size-format.js b/test/acceptance/buffer-size-format.js
index 2366d035..ba8955e7 100644
--- a/test/acceptance/buffer-size-format.js
+++ b/test/acceptance/buffer-size-format.js
@@ -152,7 +152,7 @@ describe('buffer size per format', function () {
                 });
             });
         };
-        if (test.format === 'mvt'){
+        if (process.env.POSTGIS_VERSION === '2.4' && test.format === 'mvt'){
             testFn(true);
         }
         testFn(false);
@@ -465,7 +465,7 @@ describe('buffer size per format for named maps w/o placeholders', function () {
                     });
                 });
         };
-        if (test.format === 'mvt'){
+        if (process.env.POSTGIS_VERSION === '2.4' && test.format === 'mvt'){
             testFn(true);
         }
         testFn(false);