diff --git a/vlib/v/checker/assign.v b/vlib/v/checker/assign.v
index 9c766c6ccf..6055193c7f 100644
--- a/vlib/v/checker/assign.v
+++ b/vlib/v/checker/assign.v
@@ -212,9 +212,9 @@ fn (mut c Checker) assign_stmt(mut node ast.AssignStmt) {
 			if left_type == ast.int_type {
 				if mut right is ast.IntegerLiteral {
 					mut is_large := right.val.len > 13
-					if !is_large && right.val.len > 8 {
+					if !is_large && right.val.len > 9 {
 						val := right.val.i64()
-						is_large = val > int_max || val < int_min
+						is_large = overflows_i32(val)
 					}
 					if is_large {
 						c.error('overflow in implicit type `int`, use explicit type casting instead',
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index bc82b9469d..1773b8b991 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -15,8 +15,6 @@ import v.pkgconfig
 import v.transformer
 import v.comptime
 
-const int_min = int(0x80000000)
-const int_max = int(0x7FFFFFFF)
 // prevent stack overflows by restricting too deep recursion:
 const expr_level_cutoff_limit = 40
 const stmt_level_cutoff_limit = 40
@@ -1792,9 +1790,9 @@ fn (mut c Checker) const_decl(mut node ast.ConstDecl) {
 		if field.typ == ast.int_type {
 			if mut field.expr is ast.IntegerLiteral {
 				mut is_large := field.expr.val.len > 13
-				if !is_large && field.expr.val.len > 8 {
+				if !is_large && field.expr.val.len > 9 {
 					val := field.expr.val.i64()
-					is_large = val > checker.int_max || val < checker.int_min
+					is_large = overflows_i32(val)
 				}
 				if is_large {
 					c.error('overflow in implicit type `int`, use explicit type casting instead',
diff --git a/vlib/v/checker/comptime.v b/vlib/v/checker/comptime.v
index e8ffceb5e2..27a6b7a3ef 100644
--- a/vlib/v/checker/comptime.v
+++ b/vlib/v/checker/comptime.v
@@ -402,6 +402,9 @@ fn (mut c Checker) eval_comptime_const_expr(expr ast.Expr, nlevel int) ?ast.Comp
 			if expr.typ == ast.i64_type {
 				return cast_expr_value.i64() or { return none }
 			}
+			if expr.typ == ast.int_type {
+				return cast_expr_value.i64() or { return none }
+			}
 			//
 			if expr.typ == ast.u8_type {
 				return cast_expr_value.u8() or { return none }
@@ -1021,3 +1024,27 @@ fn (mut c Checker) pop_comptime_info() {
 	c.comptime.comptime_for_method = old.comptime_for_method
 	c.comptime.comptime_for_method_ret_type = old.comptime_for_method_ret_type
 }
+
+fn overflows_i8(val i64) bool {
+	return val > max_i8 || val < min_i8
+}
+
+fn overflows_i16(val i64) bool {
+	return val > max_i16 || val < min_i16
+}
+
+fn overflows_i32(val i64) bool {
+	return val > max_i32 || val < min_i32
+}
+
+fn overflows_u8(val i64) bool {
+	return val > max_u8 || val < min_u8
+}
+
+fn overflows_u16(val i64) bool {
+	return val > max_u16 || val < min_u16
+}
+
+fn overflows_u32(val i64) bool {
+	return val > max_u32 || val < min_u32
+}
diff --git a/vlib/v/tests/fixed_array_const_size_test.v b/vlib/v/tests/fixed_array_const_size_test.v
index f9787c9d3f..d6c3724d74 100644
--- a/vlib/v/tests/fixed_array_const_size_test.v
+++ b/vlib/v/tests/fixed_array_const_size_test.v
@@ -2,6 +2,7 @@ const size = 5
 const u64_size = u64(5)
 const int_size = int(1)
 const infix_cast_size = int(100 / 50)
+const int_sizeof_cast_size = ((1600 / 8) / int(sizeof(u64)))
 
 struct Foo {
 	bar [size]u8
@@ -105,3 +106,8 @@ fn test_infix_const_expr_used_as_fixed_array_size() {
 	println(mat6)
 	assert mat6.data.len == 6
 }
+
+fn test_int_sizeof_size() {
+	arr_fixed := [int_sizeof_cast_size]int{}
+	assert arr_fixed.len == 25
+}