diff --git a/_test/tests/inc/io_readfile.test.php b/_test/tests/inc/io_readfile.test.php
index 43bb7f80c90cf0437253912e18cd65d5d10bb898..b11bae1cbb2f7f930b987f7f35ce9cef24009fce 100644
--- a/_test/tests/inc/io_readfile.test.php
+++ b/_test/tests/inc/io_readfile.test.php
@@ -8,7 +8,9 @@ class io_readfile_test extends DokuWikiTest {
     public function test_ext_zlib() {
         if (!DOKU_HAS_GZIP) {
             $this->markTestSkipped('skipping all zlib tests.  Need zlib extension');
+            return;
         }
+        $this->assertTrue(true);
     }
 
     /*
@@ -17,7 +19,9 @@ class io_readfile_test extends DokuWikiTest {
     public function test_ext_bz2() {
         if (!DOKU_HAS_BZIP) {
             $this->markTestSkipped('skipping all bzip2 tests.  Need bz2 extension');
+            return;
         }
+        $this->assertTrue(true);
     }
 
     function test_plain(){
diff --git a/_test/tests/inc/io_replaceinfile.test.php b/_test/tests/inc/io_replaceinfile.test.php
index 58a29d86bcc7335aa4b87d3155548785db5d9e62..3fb81b256b8b7d54767d7ed3d6b42337831ece19 100644
--- a/_test/tests/inc/io_replaceinfile.test.php
+++ b/_test/tests/inc/io_replaceinfile.test.php
@@ -10,7 +10,9 @@ class io_replaceinfile_test extends DokuWikiTest {
     public function test_ext_zlib() {
         if (!DOKU_HAS_GZIP) {
             $this->markTestSkipped('skipping all zlib tests.  Need zlib extension');
+            return;
         }
+        $this->assertTrue(true);
     }
 
     /*
@@ -19,7 +21,9 @@ class io_replaceinfile_test extends DokuWikiTest {
     public function test_ext_bz2() {
         if (!DOKU_HAS_BZIP) {
             $this->markTestSkipped('skipping all bzip2 tests.  Need bz2 extension');
+            return;
         }
+        $this->assertTrue(true);
     }
 
     function _write($file){
diff --git a/_test/tests/inc/io_savefile.test.php b/_test/tests/inc/io_savefile.test.php
index 5f387b8a16bbe12537af047c43d97f444399209f..0dfb551cc4ec6d66f37d660731409cf1b17026a0 100644
--- a/_test/tests/inc/io_savefile.test.php
+++ b/_test/tests/inc/io_savefile.test.php
@@ -8,7 +8,9 @@ class io_savefile_test extends DokuWikiTest {
     public function test_ext_zlib() {
         if (!DOKU_HAS_GZIP) {
             $this->markTestSkipped('skipping all zlib tests.  Need zlib extension');
+            return;
         }
+        $this->assertTrue(true);
     }
 
     /*
@@ -17,7 +19,9 @@ class io_savefile_test extends DokuWikiTest {
     public function test_ext_bz2() {
         if (!DOKU_HAS_BZIP) {
             $this->markTestSkipped('skipping all bzip2 tests.  Need bz2 extension');
+            return;
         }
+        $this->assertTrue(true);
     }
 
     function _write($file){