diff --git a/test/init.inc b/test/init.inc
index 9a03b6569c..d46bc81f35 100644
--- a/test/init.inc
+++ b/test/init.inc
@@ -108,10 +108,14 @@ function add_prefs($file) {
     PassThru("../tools/add prefs -email_addr $BOINC_EMAIL -prefs_file $file");
 }
 
-function add_platform() {
+function add_platform($platform) {
     global $BOINC_PLATFORM;
 
-    PassThru("../tools/add platform -platform_name $BOINC_PLATFORM");
+    if( $platform ) {
+        PassThru("../tools/add platform -platform_name $platform");
+    } else {
+        PassThru("../tools/add platform -platform_name $BOINC_PLATFORM");
+    }
 }
 
 function add_core_client_message($message, $priority) {
diff --git a/test/test_concat.php b/test/test_concat.php
index 9441993d76..9c8bdaa216 100644
--- a/test/test_concat.php
+++ b/test/test_concat.php
@@ -11,7 +11,7 @@
     clear_data_dirs();
     init_client_dirs("account1.xml");
     copy_to_download_dir("input");
-    add_platform();
+    add_platform(null);
     add_core_client();
     add_user(null);
     add_app("concat");
diff --git a/test/test_uc.php b/test/test_uc.php
index 4829c3239c..c986635b7d 100644
--- a/test/test_uc.php
+++ b/test/test_uc.php
@@ -11,7 +11,7 @@
     clear_data_dirs();
     init_client_dirs("account1.xml");
     copy_to_download_dir("input");
-    add_platform();
+    add_platform(null);
     add_user(null);
     add_app("upper_case");
     create_work("-appname upper_case -wu_name uc_wu -wu_template uc_wu -result_template uc_result -nresults 2 input input");