diff --git a/CppEmitter.cpp b/CppEmitter.cpp
index 0a9145d..3fec1fa 100644
--- a/CppEmitter.cpp
+++ b/CppEmitter.cpp
@@ -288,6 +288,9 @@ std::ostream& operator<<(std::ostream &stream, Type const& type) {
         case Type::VOID:
             stream << "void";
             break;
+        case Type::UNKNOWN:
+            stream << "???????????";
+            break;
     }
 
     return stream;
diff --git a/Nodes.hpp b/Nodes.hpp
index 1e086f5..b8665cc 100644
--- a/Nodes.hpp
+++ b/Nodes.hpp
@@ -38,7 +38,8 @@ enum class Type {
     FLOAT,
     BOOL,
     DOUBLE,
-    VOID
+    VOID,
+    UNKNOWN
 };
 
 enum class Operator {