diff --git a/src/vulkan/anv_device.c b/src/vulkan/anv_device.c
index 6f874b2d1ab..21184c4a201 100644
--- a/src/vulkan/anv_device.c
+++ b/src/vulkan/anv_device.c
@@ -1534,7 +1534,7 @@ VkResult anv_CreateEvent(
    assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_EVENT_CREATE_INFO);
 
    state = anv_state_pool_alloc(&device->dynamic_state_pool,
-                                sizeof(*event), 4);
+                                sizeof(*event), 8);
    event = state.map;
    event->state = state;
    event->semaphore = VK_EVENT_RESET;
diff --git a/src/vulkan/anv_private.h b/src/vulkan/anv_private.h
index 29d3c82b9b9..6da714ad8b2 100644
--- a/src/vulkan/anv_private.h
+++ b/src/vulkan/anv_private.h
@@ -1306,7 +1306,7 @@ struct anv_fence {
 };
 
 struct anv_event {
-   uint32_t                                     semaphore;
+   uint64_t                                     semaphore;
    struct anv_state                             state;
 };