diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 516bb00157..763a55ac29 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -502,6 +502,8 @@ fn (mut c Checker) fail_if_immutable(expr ast.Expr) {
 					c.error('`$it.name` is immutable, declare it with `mut` to make it mutable',
 						it.pos)
 				}
+			} else if it.name in c.const_names {
+				c.error('cannot assign to constant `$it.name`', it.pos)
 			}
 		}
 		ast.IndexExpr {
diff --git a/vlib/v/checker/tests/const_field_add_err.out b/vlib/v/checker/tests/const_field_add_err.out
new file mode 100644
index 0000000000..dcae543d9f
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_add_err.out
@@ -0,0 +1,6 @@
+vlib/v/checker/tests/const_field_add_err.v:6:2: error: cannot assign to constant `a` 
+    4 | 
+    5 | fn main() {
+    6 |     a += 1
+      |     ^
+    7 | }
diff --git a/vlib/v/checker/tests/const_field_add_err.vv b/vlib/v/checker/tests/const_field_add_err.vv
new file mode 100644
index 0000000000..24a6bb5e9b
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_add_err.vv
@@ -0,0 +1,7 @@
+const (
+	a = 1
+)
+
+fn main() {
+	a += 1
+}
diff --git a/vlib/v/checker/tests/const_field_dec_err.out b/vlib/v/checker/tests/const_field_dec_err.out
new file mode 100644
index 0000000000..27e96e62c5
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_dec_err.out
@@ -0,0 +1,6 @@
+vlib/v/checker/tests/const_field_dec_err.v:6:2: error: cannot assign to constant `a` 
+    4 | 
+    5 | fn main() {
+    6 |     a--
+      |     ^
+    7 | }
diff --git a/vlib/v/checker/tests/const_field_dec_err.vv b/vlib/v/checker/tests/const_field_dec_err.vv
new file mode 100644
index 0000000000..0f9983989a
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_dec_err.vv
@@ -0,0 +1,7 @@
+const (
+	a = 1
+)
+
+fn main() {
+	a--
+}
diff --git a/vlib/v/checker/tests/const_field_inc_err.out b/vlib/v/checker/tests/const_field_inc_err.out
new file mode 100644
index 0000000000..b35ef2c98b
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_inc_err.out
@@ -0,0 +1,6 @@
+vlib/v/checker/tests/const_field_inc_err.v:6:2: error: cannot assign to constant `a` 
+    4 | 
+    5 | fn main() {
+    6 |     a++
+      |     ^
+    7 | }
diff --git a/vlib/v/checker/tests/const_field_inc_err.vv b/vlib/v/checker/tests/const_field_inc_err.vv
new file mode 100644
index 0000000000..9d0d96e744
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_inc_err.vv
@@ -0,0 +1,7 @@
+const (
+	a = 1
+)
+
+fn main() {
+	a++
+}
diff --git a/vlib/v/checker/tests/const_field_sub_err.out b/vlib/v/checker/tests/const_field_sub_err.out
new file mode 100644
index 0000000000..daf95cbe53
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_sub_err.out
@@ -0,0 +1,6 @@
+vlib/v/checker/tests/const_field_sub_err.v:6:2: error: cannot assign to constant `a` 
+    4 | 
+    5 | fn main() {
+    6 |     a -= 1
+      |     ^
+    7 | }
diff --git a/vlib/v/checker/tests/const_field_sub_err.vv b/vlib/v/checker/tests/const_field_sub_err.vv
new file mode 100644
index 0000000000..e6c021bf75
--- /dev/null
+++ b/vlib/v/checker/tests/const_field_sub_err.vv
@@ -0,0 +1,7 @@
+const (
+	a = 1
+)
+
+fn main() {
+	a -= 1
+}