diff --git a/vlib/v/parser/pratt.v b/vlib/v/parser/pratt.v
index 50f2deedde..1a5a1e0a1b 100644
--- a/vlib/v/parser/pratt.v
+++ b/vlib/v/parser/pratt.v
@@ -122,7 +122,10 @@ pub fn (mut p Parser) expr(precedence int) ast.Expr {
 					pos: pos
 				}
 			} else {
+				save_expr_mod := p.expr_mod
+				p.expr_mod = ''
 				sizeof_type := p.parse_type()
+				p.expr_mod = save_expr_mod
 				node = ast.SizeOf{
 					is_type: true
 					typ: sizeof_type
diff --git a/vlib/v/tests/sizeof_test.v b/vlib/v/tests/sizeof_test.v
new file mode 100644
index 0000000000..bea1d39360
--- /dev/null
+++ b/vlib/v/tests/sizeof_test.v
@@ -0,0 +1,6 @@
+import math
+
+fn test_sizeof() {
+	r := math.f32_from_bits(sizeof(int))
+	assert r > 5.6e-45 && r < 5.7e-45
+}