diff --git a/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp b/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
index f52dc1d..e699849 100644
--- a/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
+++ b/external/vulkancts/modules/vulkan/api/vktApiFeatureInfo.cpp
@@ -2650,9 +2650,9 @@
 
 			if (queryResult == VK_SUCCESS)
 			{
-				const deUint32	fullMipPyramidSize	= de::max(de::max(deLog2Ceil32(properties.maxExtent.width),
-																	  deLog2Ceil32(properties.maxExtent.height)),
-															  deLog2Ceil32(properties.maxExtent.depth)) + 1;
+				const deUint32	fullMipPyramidSize	= de::max(de::max(deLog2Floor32(properties.maxExtent.width),
+																	  deLog2Floor32(properties.maxExtent.height)),
+															  deLog2Floor32(properties.maxExtent.depth)) + 1;
 
 				log << TestLog::Message << properties << "\n" << TestLog::EndMessage;