diff --git a/vlib/v/parser/fn.v b/vlib/v/parser/fn.v
index 1a01e88ffa..b1ea627548 100644
--- a/vlib/v/parser/fn.v
+++ b/vlib/v/parser/fn.v
@@ -8,9 +8,14 @@ import (
 	v.table
 )
 
-pub fn (p mut Parser) call_expr(is_c bool) ast.CallExpr {
+pub fn (p mut Parser) call_expr(is_c bool, mod string) ast.CallExpr {
 	tok := p.tok
-	fn_name := p.check_name()
+	name := p.check_name()
+	fn_name := if mod.len > 0 {
+		'${mod}.$name'
+	} else {
+		name
+	}
 	p.check(.lpar)
 	args := p.call_args()
 	node := ast.CallExpr{
@@ -147,7 +152,7 @@ fn (p mut Parser) fn_decl() ast.FnDecl {
 	}
 	else {
 		p.table.register_fn(table.Fn{
-			name: name
+			name: p.prepend_mod(name)
 			args: args
 			return_type: typ
 			is_variadic: is_variadic
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 4c5373e857..60ffa8d47b 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -519,15 +519,12 @@ fn (p mut Parser) struct_init() ast.StructInit {
 
 pub fn (p mut Parser) name_expr() ast.Expr {
 	mut node := ast.Expr{}
-	is_c := p.tok.lit == 'C' && p.peek_tok.kind == .dot
-	if is_c {
-		p.next()
-		p.check(.dot)
-	}
-	// TODO: type is getting skipped for call_expr hence current error
-	// strings.new_builder becomes new_builder. 
-	//if p.peek_tok.kind == .dot && p.tok.lit in p.table.imports {
-	if p.peek_tok.kind == .dot && p.tok.lit in p.imports {
+	is_c := p.tok.lit == 'C'
+	mut mod := ''
+	if p.peek_tok.kind == .dot && (is_c || p.tok.lit in p.imports) {
+		if !is_c {
+			mod = p.tok.lit
+		}
 		p.next()
 		p.check(.dot)
 	}
@@ -563,13 +560,13 @@ pub fn (p mut Parser) name_expr() ast.Expr {
 		// fn call
 		else {
 			// println('calling $p.tok.lit')
-			x := p.call_expr(is_c) // TODO `node,typ :=` should work
+			x := p.call_expr(is_c, mod) // TODO `node,typ :=` should work
 			node = x
 		}
 	}
 	else if p.peek_tok.kind == .lcbr && (p.tok.lit[0].is_capital() || is_c ||
 	//
-	p.tok.lit in ['array', 'string', 'ustring', 'mapnode', 'map']) &&
+	p.tok.lit in table.builtin_type_names) &&
 	//
 	(p.tok.lit.len == 1 || !p.tok.lit[p.tok.lit.len - 1].is_capital())
 	//
diff --git a/vlib/v/table/atype_symbols.v b/vlib/v/table/atype_symbols.v
index 52ca187317..db67f87328 100644
--- a/vlib/v/table/atype_symbols.v
+++ b/vlib/v/table/atype_symbols.v
@@ -43,7 +43,8 @@ pub const (
 
 pub const (
 	builtin_type_names = ['void', 'voidptr', 'charptr', 'byteptr', 'i8', 'i16', 'int', 'i64', 'u16', 'u32', 'u64',
-	'f32', 'f64', 'string', 'char', 'byte', 'bool', 'struct', 'array', 'array_fixed', 'map']
+	'f32', 'f64', 'string', 'char', 'byte', 'bool', 'struct', 'array', 'array_fixed', 'map',
+	'mapnode', 'ustring']
 )
 
 pub struct MultiReturn {