diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 58b68f0b06..9ee4286f2e 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -292,12 +292,12 @@ pub fn (c mut Checker) infix_expr(infix_expr mut ast.InfixExpr) table.Type {
 	}
 	if infix_expr.op in [.key_in, .not_in] {
 		if !(right.kind in [.array, .map, .string]) {
-			c.error('`in` can only be used with an array/map/string.', infix_expr.pos)
+			c.error('`in` can only be used with an array/map/string', infix_expr.pos)
 		}
 		if right.kind == .array {
 			right_sym := c.table.get_type_symbol(right.array_info().elem_type)
 			if left.kind != .alias && left.kind != right_sym.kind {
-				c.error('the data type on the left of `in` does not match the array item type.', infix_expr.pos)
+				c.error('the data type on the left of `in` does not match the array item type', infix_expr.pos)
 			}
 		}
 		return table.bool_type
diff --git a/vlib/v/checker/tests/inout/in_array_mismatch_type.out b/vlib/v/checker/tests/inout/in_array_mismatch_type.out
index c9ba19b18c..248601018b 100644
--- a/vlib/v/checker/tests/inout/in_array_mismatch_type.out
+++ b/vlib/v/checker/tests/inout/in_array_mismatch_type.out
@@ -1,4 +1,4 @@
-vlib/v/checker/tests/inout/in_array_mismatch_type.v:2:7: error: the data type on the left of `in` does not match the array item type.
+vlib/v/checker/tests/inout/in_array_mismatch_type.v:2:7: error: the data type on the left of `in` does not match the array item type
     1| fn main() {
     2|     if 1 in ['1', '2'] {
                 ~~