diff --git a/external/vulkancts/modules/vulkan/api/vktApiMemoryRequirementInvarianceTests.cpp b/external/vulkancts/modules/vulkan/api/vktApiMemoryRequirementInvarianceTests.cpp
index 6e2723fe35..bb0667f1c7 100644
--- a/external/vulkancts/modules/vulkan/api/vktApiMemoryRequirementInvarianceTests.cpp
+++ b/external/vulkancts/modules/vulkan/api/vktApiMemoryRequirementInvarianceTests.cpp
@@ -180,12 +180,18 @@ ImageAllocator::ImageAllocator (deRandom& random, deBool dedicated, std::vector<
 	else
 		m_colorFormat = (VkFormat)optimalformats[deRandom_getUint32(&random) % optimalformats.size()];
 
-	int	widthAlignment	= (isYCbCr420Format(m_colorFormat) || isYCbCr422Format(m_colorFormat)) ? 2 : 1;
-	int	heightAlignment	= isYCbCr420Format(m_colorFormat) ? 2 : 1;
+	if (!isPvrtcFormat(m_colorFormat)) {
+		int	widthAlignment	= (isYCbCr420Format(m_colorFormat) || isYCbCr422Format(m_colorFormat)) ? 2 : 1;
+		int	heightAlignment	= isYCbCr420Format(m_colorFormat) ? 2 : 1;
+
+		// Random small size for causing potential alignment issues
+		m_size			= tcu::IVec2((deRandom_getUint32(&random) % 16 + 3) & ~(widthAlignment - 1),
+									(deRandom_getUint32(&random) % 16 + 3) & ~(heightAlignment - 1));
+	} else {
+		m_size = tcu::IVec2(pow(2, deRandom_getUint32(&random) % 4),
+							pow(2, deRandom_getUint32(&random) % 4));
+	}
 
-	// Random small size for causing potential alignment issues
-	m_size			= tcu::IVec2((deRandom_getUint32(&random) % 16 + 3) & ~(widthAlignment - 1),
-								 (deRandom_getUint32(&random) % 16 + 3) & ~(heightAlignment - 1));
 	// Pick random memory type from the supported set
 	m_memoryType	= memoryTypes[deRandom_getUint32(&random) % memoryTypes.size()];
 }
diff --git a/external/vulkancts/modules/vulkan/vktTestCase.cpp b/external/vulkancts/modules/vulkan/vktTestCase.cpp
index 4ab6fb5f90..eccc430351 100644
--- a/external/vulkancts/modules/vulkan/vktTestCase.cpp
+++ b/external/vulkancts/modules/vulkan/vktTestCase.cpp
@@ -103,6 +103,7 @@ vector<string> filterExtensions (const vector<VkExtensionProperties>& extensions
 		"VK_NV_representative_fragment_test",
 		"VK_NV_shader_atomic_float16_vector",
 		"VK_MVK_macos_surface",
+		"VK_IMG_format_pvrtc"
 	};
 
 	const char* exclusions[] =