diff --git a/boa_tester/src/exec/mod.rs b/boa_tester/src/exec/mod.rs
index dac771f1e69..27cec2efd4c 100644
--- a/boa_tester/src/exec/mod.rs
+++ b/boa_tester/src/exec/mod.rs
@@ -250,7 +250,7 @@ impl Test {
                 let dyn_loader: &dyn ModuleLoader = loader;
                 let context = &mut Context::builder()
                     .module_loader(dyn_loader)
-                    .can_block(self.flags.contains(TestFlags::CAN_BLOCK_IS_TRUE))
+                    .can_block(!self.flags.contains(TestFlags::CAN_BLOCK_IS_FALSE))
                     .build()
                     .expect("cannot fail with default global object");
 
@@ -445,7 +445,7 @@ impl Test {
                 let dyn_loader: &dyn ModuleLoader = loader;
                 let context = &mut Context::builder()
                     .module_loader(dyn_loader)
-                    .can_block(self.flags.contains(TestFlags::CAN_BLOCK_IS_TRUE))
+                    .can_block(!self.flags.contains(TestFlags::CAN_BLOCK_IS_FALSE))
                     .build()
                     .expect("cannot fail with default global object");
                 context.strict(strict);