diff --git a/src/xrt/compositor/main/comp_compositor.c b/src/xrt/compositor/main/comp_compositor.c
index 89ca0d499..1e1297021 100644
--- a/src/xrt/compositor/main/comp_compositor.c
+++ b/src/xrt/compositor/main/comp_compositor.c
@@ -696,17 +696,17 @@ compositor_init_vulkan(struct comp_compositor *c)
 	    .instance_extensions =
 	        {
 	            .array = NULL, // Filled in below
-	            .num = 0,      // Filled in below
+	            .count = 0,    // Filled in below
 	        },
 	    .required_device_extensions =
 	        {
 	            .array = required_device_extensions,
-	            .num = ARRAY_SIZE(required_device_extensions),
+	            .count = ARRAY_SIZE(required_device_extensions),
 	        },
 	    .optional_device_extensions =
 	        {
 	            .array = optional_device_extensions,
-	            .num = ARRAY_SIZE(optional_device_extensions),
+	            .count = ARRAY_SIZE(optional_device_extensions),
 	        },
 	    .log_level = c->settings.log_level,
 	    .only_compute_queue = c->settings.use_compute,
@@ -716,7 +716,7 @@ compositor_init_vulkan(struct comp_compositor *c)
 
 	struct comp_vulkan_results vk_res = {0};
 
-	ret = select_instances_extensions(c, &vk_args.instance_extensions.array, &vk_args.instance_extensions.num);
+	ret = select_instances_extensions(c, &vk_args.instance_extensions.array, &vk_args.instance_extensions.count);
 	if (ret != VK_SUCCESS) {
 		CVK_ERROR(c, "select_instances_extensions", "Failed to select instance extensions.", ret);
 		return ret;
diff --git a/src/xrt/compositor/util/comp_vulkan.c b/src/xrt/compositor/util/comp_vulkan.c
index 803a0df63..c251cce4d 100644
--- a/src/xrt/compositor/util/comp_vulkan.c
+++ b/src/xrt/compositor/util/comp_vulkan.c
@@ -120,7 +120,7 @@ create_instance(struct vk_bundle *vk, const struct comp_vulkan_arguments *vk_arg
 	VkInstanceCreateInfo instance_info = {
 	    .sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
 	    .pApplicationInfo = &app_info,
-	    .enabledExtensionCount = vk_args->instance_extensions.num,
+	    .enabledExtensionCount = vk_args->instance_extensions.count,
 	    .ppEnabledExtensionNames = vk_args->instance_extensions.array,
 	};
 
@@ -172,9 +172,9 @@ create_device(struct vk_bundle *vk, const struct comp_vulkan_arguments *vk_args)
 		    only_compute_queue,                        // compute_only
 		    prios[i],                                  // global_priority
 		    vk_args->required_device_extensions.array, //
-		    vk_args->required_device_extensions.num,   //
+		    vk_args->required_device_extensions.count, //
 		    vk_args->optional_device_extensions.array, //
-		    vk_args->optional_device_extensions.num,   //
+		    vk_args->optional_device_extensions.count, //
 		    &device_features);                         // optional_device_features
 
 		// All ok!
diff --git a/src/xrt/compositor/util/comp_vulkan.h b/src/xrt/compositor/util/comp_vulkan.h
index ec6212c8d..304cf86cb 100644
--- a/src/xrt/compositor/util/comp_vulkan.h
+++ b/src/xrt/compositor/util/comp_vulkan.h
@@ -25,7 +25,7 @@ extern "C" {
 struct comp_vulkan_extension_list
 {
 	const char **array;
-	uint32_t num;
+	uint32_t count;
 };
 
 /*!