diff --git a/boa_engine/src/environments/runtime.rs b/boa_engine/src/environments/runtime.rs
index ddf9ae79462..ecc536d9a71 100644
--- a/boa_engine/src/environments/runtime.rs
+++ b/boa_engine/src/environments/runtime.rs
@@ -951,6 +951,7 @@ impl Context<'_> {
         mut binding_index: usize,
         name: Identifier,
         value: JsValue,
+        strict: bool,
     ) -> JsResult<bool> {
         for env_index in (environment_index + 1..self.vm.environments.stack.len()).rev() {
             let env = self.environment_expect(env_index);
@@ -983,7 +984,7 @@ impl Context<'_> {
                                 continue;
                             }
                         }
-                        return o.set(key, value, true, self);
+                        return o.set(key, value, strict, self);
                     }
                 }
             }
@@ -1017,6 +1018,7 @@ impl Context<'_> {
         &mut self,
         name: Identifier,
         value: &JsValue,
+        strict: bool,
     ) -> JsResult<bool> {
         for env_index in (0..self.vm.environments.stack.len()).rev() {
             let env = self.environment_expect(env_index);
@@ -1056,7 +1058,7 @@ impl Context<'_> {
                                 continue;
                             }
                         }
-                        return o.set(key, value.clone(), true, self);
+                        return o.set(key, value.clone(), strict, self);
                     }
                 }
             }
diff --git a/boa_engine/src/vm/opcode/define/mod.rs b/boa_engine/src/vm/opcode/define/mod.rs
index 42aaa3bc681..9f04f782cd8 100644
--- a/boa_engine/src/vm/opcode/define/mod.rs
+++ b/boa_engine/src/vm/opcode/define/mod.rs
@@ -59,7 +59,11 @@ impl Operation for DefInitVar {
         binding_locator.throw_mutate_immutable(context)?;
 
         if binding_locator.is_global() {
-            if !context.put_value_if_global_poisoned(binding_locator.name(), &value)? {
+            if !context.put_value_if_global_poisoned(
+                binding_locator.name(),
+                &value,
+                context.vm.frame().code_block.strict,
+            )? {
                 let key = context
                     .interner()
                     .resolve_expect(binding_locator.name().sym())
diff --git a/boa_engine/src/vm/opcode/set/name.rs b/boa_engine/src/vm/opcode/set/name.rs
index 65a99f73198..f764e82ff53 100644
--- a/boa_engine/src/vm/opcode/set/name.rs
+++ b/boa_engine/src/vm/opcode/set/name.rs
@@ -25,7 +25,11 @@ impl Operation for SetName {
         binding_locator.throw_mutate_immutable(context)?;
 
         if binding_locator.is_global() {
-            if !context.put_value_if_global_poisoned(binding_locator.name(), &value)? {
+            if !context.put_value_if_global_poisoned(
+                binding_locator.name(),
+                &value,
+                context.vm.frame().code_block.strict,
+            )? {
                 let key: JsString = context
                     .interner()
                     .resolve_expect(binding_locator.name().sym())
@@ -55,6 +59,7 @@ impl Operation for SetName {
             binding_locator.binding_index(),
             binding_locator.name(),
             value,
+            context.vm.frame().code_block.strict,
         )? {
             return Err(JsNativeError::reference()
                 .with_message(format!(