diff --git a/src/vulkan/util/vk_alloc.h b/src/vulkan/util/vk_alloc.h
index 18b0d73b052..8553237e8c7 100644
--- a/src/vulkan/util/vk_alloc.h
+++ b/src/vulkan/util/vk_alloc.h
@@ -234,7 +234,7 @@ vk_multialloc_alloc(struct vk_multialloc *ma,
                     const VkAllocationCallbacks *alloc,
                     VkSystemAllocationScope scope)
 {
-   char *ptr = (char *)vk_alloc(alloc, ma->size, ma->align, scope);
+   void *ptr = vk_alloc(alloc, ma->size, ma->align, scope);
    if (!ptr)
       return NULL;
 
@@ -250,7 +250,7 @@ vk_multialloc_alloc(struct vk_multialloc *ma,
    STATIC_ASSERT(ARRAY_SIZE(ma->ptrs) == 8);
 #define _VK_MULTIALLOC_UPDATE_POINTER(_i) \
    if ((_i) < ma->ptr_count) \
-      *ma->ptrs[_i] = ptr + (uintptr_t)*ma->ptrs[_i]
+      *ma->ptrs[_i] = (char *)ptr + (uintptr_t)*ma->ptrs[_i]
    _VK_MULTIALLOC_UPDATE_POINTER(0);
    _VK_MULTIALLOC_UPDATE_POINTER(1);
    _VK_MULTIALLOC_UPDATE_POINTER(2);