diff --git a/libraries/fc/include/fc/static_variant.hpp b/libraries/fc/include/fc/static_variant.hpp
index 3a0a7ab72ad3364567bb65984019f1259ad741c2..3801c731149bcb7ba394f5460592964275627b1f 100644
--- a/libraries/fc/include/fc/static_variant.hpp
+++ b/libraries/fc/include/fc/static_variant.hpp
@@ -195,7 +195,7 @@ class static_variant {
     static_assert(impl::type_info<Types...>::no_reference_types, "Reference types are not permitted in static_variant.");
     static_assert(impl::type_info<Types...>::no_duplicates, "static_variant type arguments contain duplicate types.");
 
-    int _tag;
+    uint32_t _tag;
     char storage[impl::type_info<Types...>::size];
 
     template<typename X>