diff --git a/core/src/variant.h b/core/src/variant.h
index b7b4a9e..d20b7ec 100644
--- a/core/src/variant.h
+++ b/core/src/variant.h
@@ -14,6 +14,7 @@ typedef enum VariantType {
 
 typedef struct Variant {
     VariantType type;
+    size_t string_size;
     union {
         double as_number;
         Vector as_vector;
@@ -25,6 +26,7 @@ typedef struct Variant {
 #define NumberVariant(Value_) (Variant){.type = Variant_Number, .as_number = Value_}
 #define VectorVariant(Value_) (Variant){.type = Variant_Vector, .as_vector = Value_}
 #define ObjectVariant(Value_) (Variant){.type = Variant_Object, .as_object = Value_}
+#define StringVariant(Value_, BufSize_) (Variant){.type = Variant_String, .as_string = Value_, .string_size = BufSize_}
 #define UndefinedVariant() (Variant){.type = Variant_Undefined }
 
 #endif // !_fencer_variant_h