diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 4ce47a6648..f9d643c7f2 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -3446,6 +3446,11 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
 		c.warn('casting `$ft` to `$tt` is only allowed in `unsafe` code', node.pos)
 	} else if from_type_sym.kind == .array_fixed && !from_type.is_ptr() {
 		c.warn('cannot cast a fixed array (use e.g. `&arr[0]` instead)', node.pos)
+	} else if from_type_sym_final.kind == .string && to_type_sym_final.is_number()
+		&& to_type_sym_final.kind != .rune {
+		snexpr := node.expr.str()
+		c.error('cannot cast string to `$to_type_sym.name`, use `${snexpr}.${to_type_sym_final.name}()` instead.',
+			node.pos)
 	}
 
 	if to_type == ast.string_type {
diff --git a/vlib/v/checker/tests/cast_string_to_int_err.out b/vlib/v/checker/tests/cast_string_to_int_err.out
new file mode 100644
index 0000000000..7076b96f02
--- /dev/null
+++ b/vlib/v/checker/tests/cast_string_to_int_err.out
@@ -0,0 +1,61 @@
+vlib/v/checker/tests/cast_string_to_int_err.vv:2:7: error: cannot cast string to `int`, use `'456'.int()` instead.
+    1 | fn main(){
+    2 |     _ := int('456')
+      |          ~~~~~~~~~~
+    3 |     _ := i8('11')
+    4 |     _ := i16('111')
+vlib/v/checker/tests/cast_string_to_int_err.vv:3:7: error: cannot cast string to `i8`, use `'11'.i8()` instead.
+    1 | fn main(){
+    2 |     _ := int('456')
+    3 |     _ := i8('11')
+      |          ~~~~~~~~
+    4 |     _ := i16('111')
+    5 |     _ := i64('234')
+vlib/v/checker/tests/cast_string_to_int_err.vv:4:7: error: cannot cast string to `i16`, use `'111'.i16()` instead.
+    2 |     _ := int('456')
+    3 |     _ := i8('11')
+    4 |     _ := i16('111')
+      |          ~~~~~~~~~~
+    5 |     _ := i64('234')
+    6 |     _ := f32('2.22')
+vlib/v/checker/tests/cast_string_to_int_err.vv:5:7: error: cannot cast string to `i64`, use `'234'.i64()` instead.
+    3 |     _ := i8('11')
+    4 |     _ := i16('111')
+    5 |     _ := i64('234')
+      |          ~~~~~~~~~~
+    6 |     _ := f32('2.22')
+    7 |     _ := f64('2.33333')
+vlib/v/checker/tests/cast_string_to_int_err.vv:6:7: error: cannot cast string to `f32`, use `'2.22'.f32()` instead.
+    4 |     _ := i16('111')
+    5 |     _ := i64('234')
+    6 |     _ := f32('2.22')
+      |          ~~~~~~~~~~~
+    7 |     _ := f64('2.33333')
+    8 |     _ := u16('234')
+vlib/v/checker/tests/cast_string_to_int_err.vv:7:7: error: cannot cast string to `f64`, use `'2.33333'.f64()` instead.
+    5 |     _ := i64('234')
+    6 |     _ := f32('2.22')
+    7 |     _ := f64('2.33333')
+      |          ~~~~~~~~~~~~~~
+    8 |     _ := u16('234')
+    9 |     _ := u32('2')
+vlib/v/checker/tests/cast_string_to_int_err.vv:8:7: error: cannot cast string to `u16`, use `'234'.u16()` instead.
+    6 |     _ := f32('2.22')
+    7 |     _ := f64('2.33333')
+    8 |     _ := u16('234')
+      |          ~~~~~~~~~~
+    9 |     _ := u32('2')
+   10 |     _ := u64('22')
+vlib/v/checker/tests/cast_string_to_int_err.vv:9:7: error: cannot cast string to `u32`, use `'2'.u32()` instead.
+    7 |     _ := f64('2.33333')
+    8 |     _ := u16('234')
+    9 |     _ := u32('2')
+      |          ~~~~~~~~
+   10 |     _ := u64('22')
+   11 | }
+vlib/v/checker/tests/cast_string_to_int_err.vv:10:7: error: cannot cast string to `u64`, use `'22'.u64()` instead.
+    8 |     _ := u16('234')
+    9 |     _ := u32('2')
+   10 |     _ := u64('22')
+      |          ~~~~~~~~~
+   11 | }
diff --git a/vlib/v/checker/tests/cast_string_to_int_err.vv b/vlib/v/checker/tests/cast_string_to_int_err.vv
new file mode 100644
index 0000000000..bff8973a98
--- /dev/null
+++ b/vlib/v/checker/tests/cast_string_to_int_err.vv
@@ -0,0 +1,11 @@
+fn main(){
+	_ := int('456')
+	_ := i8('11')
+	_ := i16('111')
+	_ := i64('234')
+	_ := f32('2.22')
+	_ := f64('2.33333')
+	_ := u16('234')
+	_ := u32('2')
+	_ := u64('22')
+}