diff --git a/include/neuron/type.h b/include/neuron/type.h
index 237a8ca5..a4c82faa 100644
--- a/include/neuron/type.h
+++ b/include/neuron/type.h
@@ -94,7 +94,7 @@ inline static const char *neu_type_string(neu_type_e type)
     return "";
 }
 
-#define NEU_VALUE_SIZE 128
+#define NEU_VALUE_SIZE 512
 typedef union {
     bool     boolean;
     int8_t   i8;