diff --git a/telethon_generator/parser/tl_object.py b/telethon_generator/parser/tl_object.py
index fdcf5450..600cc9a1 100755
--- a/telethon_generator/parser/tl_object.py
+++ b/telethon_generator/parser/tl_object.py
@@ -159,8 +159,14 @@ class TLArg:
             vector_match = re.match(r'vector<(\w+)>', self.type, re.IGNORECASE)
             if vector_match:
                 self.is_vector = True
-                self.type = vector_match.group(
-                    1)  # Update the type to match the one inside the vector
+
+                # If the type's first letter is not uppercase, then
+                # it is a constructor and we use (read/write) its ID
+                # as pinpointed on issue #81.
+                self.use_vector_id = self.type[0] == 'V'
+
+                # Update the type to match the one inside the vector
+                self.type = vector_match.group(1)
 
             # The name may contain "date" in it, if this is the case and the type is "int",
             # we can safely assume that this should be treated as a "date" object.
@@ -179,7 +185,10 @@ class TLArg:
             real_type = '#'
 
         if self.is_vector:
-            real_type = 'Vector<{}>'.format(real_type)
+            if self.use_vector_id:
+                real_type = 'Vector<{}>'.format(real_type)
+            else:
+                real_type = 'vector<{}>'.format(real_type)
 
         if self.is_generic:
             real_type = '!{}'.format(real_type)
diff --git a/telethon_generator/tl_generator.py b/telethon_generator/tl_generator.py
index 66a9a663..80975702 100755
--- a/telethon_generator/tl_generator.py
+++ b/telethon_generator/tl_generator.py
@@ -311,8 +311,10 @@ class TLGenerator:
                 builder.writeln('if {}:'.format(name))
 
         if arg.is_vector:
-            builder.writeln(
-                "writer.write_int(0x1cb5c415, signed=False)  # Vector's constructor ID")
+            if arg.use_vector_id:
+                builder.writeln(
+                    "writer.write_int(0x1cb5c415, signed=False)  # Vector's constructor ID")
+
             builder.writeln('writer.write_int(len({}))'.format(name))
             builder.writeln('for {}_item in {}:'.format(arg.name, name))
             # Temporary disable .is_vector, not to enter this if again
@@ -405,7 +407,9 @@ class TLGenerator:
             arg.is_flag = False
 
         if arg.is_vector:
-            builder.writeln("reader.read_int()  # Vector's constructor ID")
+            if arg.use_vector_id:
+                builder.writeln("reader.read_int()  # Vector's constructor ID")
+
             builder.writeln('{} = []  # Initialize an empty list'.format(name))
             builder.writeln('{}_len = reader.read_int()'.format(arg.name))
             builder.writeln('for _ in range({}_len):'.format(arg.name))