diff --git a/codegen/Cargo.toml b/codegen/Cargo.toml
index d384c210..c1efde59 100644
--- a/codegen/Cargo.toml
+++ b/codegen/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rhai_codegen"
-version = "1.4.2"
+version = "1.4.3"
 edition = "2018"
 resolver = "2"
 authors = ["jhwgh1968", "Stephen Chung"]
@@ -22,5 +22,5 @@ syn = { version = "1.0", features = ["full", "parsing", "printing", "proc-macro"
 quote = "1"
 
 [dev-dependencies]
-rhai = { path = "..", version = "1.6", features = ["metadata"] }
+rhai = { path = "..", version = "1.11", features = ["metadata"] }
 trybuild = "1"
diff --git a/src/eval/target.rs b/src/eval/target.rs
index a12aa96c..c48aa62a 100644
--- a/src/eval/target.rs
+++ b/src/eval/target.rs
@@ -239,6 +239,17 @@ impl<'a> Target<'a> {
             _ => None,
         }
     }
+    /// Convert a shared or reference [`Target`] into a target with an owned value.
+    #[inline(always)]
+    #[must_use]
+    pub fn into_owned(self) -> Self {
+        match self {
+            Self::RefMut(r) => Self::TempValue(r.clone()),
+            #[cfg(not(feature = "no_closure"))]
+            Self::SharedValue { value, .. } => Self::TempValue(value),
+            _ => self,
+        }
+    }
     /// Get the source [`Dynamic`] of the [`Target`].
     #[allow(dead_code)]
     #[inline]
diff --git a/src/func/call.rs b/src/func/call.rs
index 758767fb..ae4298fe 100644
--- a/src/func/call.rs
+++ b/src/func/call.rs
@@ -1234,9 +1234,13 @@ impl Engine {
                         .map(|(value, ..)| arg_values.push(value.flatten()))
                 })?;
 
-                let (target, _pos) =
+                let (mut target, _pos) =
                     self.search_namespace(scope, global, lib, this_ptr, first_expr, level)?;
 
+                if target.is_read_only() {
+                    target = target.into_owned();
+                }
+
                 self.track_operation(global, _pos)?;
 
                 #[cfg(not(feature = "no_closure"))]
diff --git a/tests/constants.rs b/tests/constants.rs
index b7df1b3a..bc49e8ee 100644
--- a/tests/constants.rs
+++ b/tests/constants.rs
@@ -87,7 +87,7 @@ fn test_constant_mut() -> Result<(), Box<EvalAltResult>> {
                 "
             )
             .expect_err("should error"),
-        EvalAltResult::ErrorAssignmentToConstant(..)
+        EvalAltResult::ErrorNonPureMethodCallOnConstant(..)
     ));
 
     let mut scope = Scope::new();
@@ -120,7 +120,7 @@ fn test_constant_mut() -> Result<(), Box<EvalAltResult>> {
         *engine
             .run_with_scope(&mut scope, "MY_NUMBER.value = 42;")
             .expect_err("should error"),
-        EvalAltResult::ErrorAssignmentToConstant(..)
+        EvalAltResult::ErrorNonPureMethodCallOnConstant(..)
     ));
 
     Ok(())
diff --git a/tests/plugins.rs b/tests/plugins.rs
index f5c8d966..ab752bc3 100644
--- a/tests/plugins.rs
+++ b/tests/plugins.rs
@@ -119,7 +119,7 @@ fn test_plugins_package() -> Result<(), Box<EvalAltResult>> {
 
         assert!(
             matches!(*engine.run("const A = [1, 2, 3]; A.test(42);").expect_err("should error"),
-            EvalAltResult::ErrorAssignmentToConstant(x, ..) if x == "array")
+            EvalAltResult::ErrorNonPureMethodCallOnConstant(x, ..) if x == "test")
         )
     }