diff --git a/core/AmArg.cpp b/core/AmArg.cpp
index 529982af..94b5e10d 100644
--- a/core/AmArg.cpp
+++ b/core/AmArg.cpp
@@ -46,6 +46,21 @@ const char* AmArg::t2str(int type) {
   }
 }
 
+AmArg::AmArg(const AmArg& v)
+  : type(v.type) {
+  switch (type) {
+    case Array:
+      value = new ValueArray(*std::get<ValueArray*>(v.value));
+      break;
+    case Struct:
+      value = new ValueStruct(*std::get<ValueStruct*>(v.value));
+      break;
+    default:
+      value = v.value;
+      break;
+  }
+}
+
 AmArg::AmArg(std::map<std::string, std::string>& v)
   : type(Undef) {
   assertStruct();
@@ -233,6 +248,23 @@ AmArg& AmArg::get(size_t idx) const {
   return (*std::get<ValueArray*>(value))[idx];
 }
 
+AmArg& AmArg::operator=(const AmArg& v) {
+  invalidate();
+  type = v.type;
+  switch (type) {
+    case Array:
+      value = new ValueArray(*std::get<ValueArray*>(v.value));
+      break;
+    case Struct:
+      value = new ValueStruct(*std::get<ValueStruct*>(v.value));
+      break;
+    default:
+      value = v.value;
+      break;
+  }
+  return *this;
+}
+
 AmArg& AmArg::operator[](size_t idx) {
   assertArray(idx+1);
   return (*std::get<ValueArray*>(value))[idx];
diff --git a/core/AmArg.h b/core/AmArg.h
index 6542eff1..ca94d940 100644
--- a/core/AmArg.h
+++ b/core/AmArg.h
@@ -128,7 +128,7 @@ class AmArg
    : type(Undef)
   { }
 
- AmArg(const AmArg& v) = default;
+ AmArg(const AmArg& v);
 
  AmArg(const int& v)
    : type(Int),
@@ -197,7 +197,7 @@ class AmArg
 
   short getType() const { return type; }
 
-  AmArg& operator=(const AmArg& rhs) = default;
+  AmArg& operator=(const AmArg& rhs);
 
 #define isArgUndef(a) (AmArg::Undef == a.getType())
 #define isArgArray(a) (AmArg::Array == a.getType())