diff --git a/vlib/v/ast/types.v b/vlib/v/ast/types.v
index 4bd3448cdf..31dd3896aa 100644
--- a/vlib/v/ast/types.v
+++ b/vlib/v/ast/types.v
@@ -208,6 +208,7 @@ pub mut:
 	conversions shared map[int][]Type
 	// generic interface support
 	is_generic     bool
+	is_markused    bool
 	generic_types  []Type
 	concrete_types []Type
 	parent_type    Type
diff --git a/vlib/v/markused/walker.v b/vlib/v/markused/walker.v
index 39ae73cee2..08e13545dd 100644
--- a/vlib/v/markused/walker.v
+++ b/vlib/v/markused/walker.v
@@ -169,6 +169,8 @@ pub fn (mut w Walker) mark_markused_syms() {
 	for sym in w.table.type_symbols {
 		if sym.info is ast.Struct && sym.info.is_markused {
 			w.mark_by_sym(sym)
+		} else if sym.info is ast.Interface && sym.info.is_markused {
+			w.mark_by_sym(sym)
 		}
 	}
 }
diff --git a/vlib/v/parser/struct.v b/vlib/v/parser/struct.v
index 78db510f40..dab6d23b86 100644
--- a/vlib/v/parser/struct.v
+++ b/vlib/v/parser/struct.v
@@ -640,6 +640,7 @@ fn (mut p Parser) interface_decl() ast.InterfaceDecl {
 		info:     ast.Interface{
 			types:         []
 			is_generic:    generic_types.len > 0
+			is_markused:   attrs.contains('markused')
 			generic_types: generic_types
 		}
 		language: language
diff --git a/vlib/v/tests/skip_unused/interface_struct_unused.run.out b/vlib/v/tests/skip_unused/interface_struct_unused.run.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/vlib/v/tests/skip_unused/interface_struct_unused.skip_unused.run.out b/vlib/v/tests/skip_unused/interface_struct_unused.skip_unused.run.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/vlib/v/tests/skip_unused/interface_struct_unused.vv b/vlib/v/tests/skip_unused/interface_struct_unused.vv
new file mode 100644
index 0000000000..7197e22d97
--- /dev/null
+++ b/vlib/v/tests/skip_unused/interface_struct_unused.vv
@@ -0,0 +1,7 @@
+@[markused]
+struct Foo {}
+
+@[markused]
+interface Bar {
+	a Foo
+}