diff --git a/src/vulkan/util/vk_util.h b/src/vulkan/util/vk_util.h
index cbe68a604cf..386e9e469f0 100644
--- a/src/vulkan/util/vk_util.h
+++ b/src/vulkan/util/vk_util.h
@@ -282,7 +282,7 @@ vk_spec_info_to_nir_spirv(const VkSpecializationInfo *spec_info,
 #define STACK_ARRAY_SIZE 8
 
 #define STACK_ARRAY(type, name, size) \
-   type _stack_##name[STACK_ARRAY_SIZE], *const name = \
+   type _stack_##name[STACK_ARRAY_SIZE] = {0}, *const name = \
       (size) <= STACK_ARRAY_SIZE ? _stack_##name : malloc((size) * sizeof(type))
 
 #define STACK_ARRAY_FINISH(name) \