diff --git a/src/callback.rs b/src/callback.rs
index c8bedbd..41f90ff 100644
--- a/src/callback.rs
+++ b/src/callback.rs
@@ -79,11 +79,11 @@ where
             let mut runtime = world.get_resource_mut::<R>().expect("No runtime resource");
 
             if R::needs_own_thread() {
-                runtime.with_engine_mut(move |engine| {
+                runtime.with_engine_thread_mut(move |engine| {
                     Out::into_runtime_value_with_engine(result, engine)
                 })
             } else {
-                runtime.with_engine_thread_mut(move |engine| {
+                runtime.with_engine_mut(move |engine| {
                     Out::into_runtime_value_with_engine(result, engine)
                 })
             }
@@ -128,11 +128,11 @@ macro_rules! impl_tuple {
                     inner_system.apply_deferred(world);
                     let mut runtime = world.get_resource_mut::<RN>().expect("No runtime resource");
                     if RN::needs_own_thread() {
-                        runtime.with_engine_mut(move |engine| {
+                        runtime.with_engine_thread_mut(move |engine| {
                             Out::into_runtime_value_with_engine(result, engine)
                         })
                     } else {
-                        runtime.with_engine_thread_mut(move |engine| {
+                        runtime.with_engine_mut(move |engine| {
                             Out::into_runtime_value_with_engine(result, engine)
                         })
                     }
diff --git a/src/runtimes/lua.rs b/src/runtimes/lua.rs
index 4ee5bab..347030a 100644
--- a/src/runtimes/lua.rs
+++ b/src/runtimes/lua.rs
@@ -300,7 +300,7 @@ impl Runtime for LuaRuntime {
     }
 
     fn needs_own_thread() -> bool {
-        true
+        false
     }
 }
 
diff --git a/src/runtimes/rhai.rs b/src/runtimes/rhai.rs
index 6807450..00d6fe4 100644
--- a/src/runtimes/rhai.rs
+++ b/src/runtimes/rhai.rs
@@ -209,7 +209,7 @@ impl Runtime for RhaiRuntime {
     }
 
     fn needs_own_thread() -> bool {
-        true
+        false
     }
 }
 
diff --git a/src/runtimes/ruby.rs b/src/runtimes/ruby.rs
index e0f706f..96f5e6b 100644
--- a/src/runtimes/ruby.rs
+++ b/src/runtimes/ruby.rs
@@ -478,7 +478,7 @@ impl Runtime for RubyRuntime {
     }
 
     fn needs_own_thread() -> bool {
-        false
+        true
     }
 }