diff --git a/core/libs/prx/libSceAgcDriver/CMakeLists.txt b/core/libs/prx/libSceAgcDriver/CMakeLists.txt
index c6950a121b..6e6a309b36 100644
--- a/core/libs/prx/libSceAgcDriver/CMakeLists.txt
+++ b/core/libs/prx/libSceAgcDriver/CMakeLists.txt
@@ -1595,7 +1595,7 @@ if(BUILD_TESTING)
         set_tests_properties(agc_driver_partially_resident_pending_stores PROPERTIES ENVIRONMENT_MODIFICATION "PATH=path_list_prepend:$<TARGET_FILE_DIR:libc>")
     endif()
     add_test(NAME agc_shader_disk_cache_large_file COMMAND agc_shader_disk_cache_tests --large-file)
-    set_tests_properties(agc_shader_disk_cache_large_file PROPERTIES SKIP_RETURN_CODE 77 WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" TIMEOUT 240)
+    set_tests_properties(agc_shader_disk_cache_large_file PROPERTIES SKIP_RETURN_CODE 77 RUN_SERIAL TRUE WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" TIMEOUT 240)
     if(WIN32)
         set_tests_properties(agc_shader_disk_cache_large_file PROPERTIES ENVIRONMENT_MODIFICATION "PATH=path_list_prepend:$<TARGET_FILE_DIR:libc>")
     endif()
diff --git a/core/libs/prx/libSceAgcDriver/tests/ShaderDiskCache.cpp b/core/libs/prx/libSceAgcDriver/tests/ShaderDiskCache.cpp
index d96411c0eb..043759d826 100644
--- a/core/libs/prx/libSceAgcDriver/tests/ShaderDiskCache.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/ShaderDiskCache.cpp
@@ -763,8 +763,8 @@ int runLargeFileWrite() {
             written->set_exception(std::current_exception());
         }
     }).detach();
-    if (result.wait_for(std::chrono::seconds(120)) != std::future_status::ready) {
-        std::cerr << "WriteFileAtomically did not return within 120 s for a file of more than 2 GiB\n";
+    if (result.wait_for(std::chrono::seconds(200)) != std::future_status::ready) {
+        std::cerr << "WriteFileAtomically did not return within 200 s for a file of more than 2 GiB\n";
         std::cerr.flush();
         std::_Exit(1);
     }