diff --git a/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp b/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp
index dd6352b3e..78a2e9a03 100644
--- a/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/Graphics.cpp
@@ -1685,8 +1685,14 @@ void AlphaToCoverageTests() {
     }
     queue.context[0x2dc] = 0xaa01;
     const auto exportFormat = queue.context.at(0x1c5);
-    queue.context[0x1c5] = (exportFormat & ~0xfu) | 1u;
-    expectFailure([&] { AgcDriver::Graphics::DecodeState(queue); }, "floating-point alpha");
+    for (const auto format : {4u, 5u, 6u, 9u}) {
+        queue.context[0x1c5] = (exportFormat & ~0xfu) | format;
+        Require(AgcDriver::Graphics::DecodeState(queue).alphaToCoverage, "alpha-to-coverage rejected an MRT0 export format with a floating-point alpha");
+    }
+    for (const auto format : {1u, 2u, 3u}) {
+        queue.context[0x1c5] = (exportFormat & ~0xfu) | format;
+        expectFailure([&] { AgcDriver::Graphics::DecodeState(queue); }, "floating-point alpha");
+    }
     queue.context[0x1c5] = exportFormat;
 }