diff --git a/layers/parameter_validation.cpp b/layers/parameter_validation.cpp
index 0db8be0..8794144 100644
--- a/layers/parameter_validation.cpp
+++ b/layers/parameter_validation.cpp
@@ -1649,7 +1649,7 @@
             device_data->enables.khx_external_memory_fd = true;
         } else if (strcmp(pCreateInfo->ppEnabledExtensionNames[i], VK_KHX_EXTERNAL_SEMAPHORE_FD_EXTENSION_NAME) == 0) {
             device_data->enables.khx_external_semaphore_fd = true;
-#ifdef VK_USE_PLATFORM_WIN32_KHR
+#ifdef VK_USE_PLATFORM_WIN32_KHX
         } else if (strcmp(pCreateInfo->ppEnabledExtensionNames[i], VK_KHX_EXTERNAL_MEMORY_WIN32_EXTENSION_NAME) == 0) {
             device_data->enables.khx_external_memory_win32 = true;
         } else if (strcmp(pCreateInfo->ppEnabledExtensionNames[i], VK_KHX_EXTERNAL_SEMAPHORE_WIN32_EXTENSION_NAME) == 0) {