diff --git a/spirv_common.hpp b/spirv_common.hpp
index 1a9a539d..b5a93c7f 100644
--- a/spirv_common.hpp
+++ b/spirv_common.hpp
@@ -1382,7 +1382,7 @@ struct Meta
 		{
 			uint32_t packed_type = 0;
 			bool packed = false;
-			uint32_t ib_member_index = -1;
+			uint32_t ib_member_index = static_cast<uint32_t>(-1);
 			uint32_t ib_orig_id = 0;
 		} extended;
 	};