diff --git a/ferretro_base/src/retro/loading.rs b/ferretro_base/src/retro/loading.rs
index 28558ce..ddd283f 100644
--- a/ferretro_base/src/retro/loading.rs
+++ b/ferretro_base/src/retro/loading.rs
@@ -7,7 +7,7 @@ use libloading;
 
 use super::ffi::*;
 
-pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
 
 pub struct LibretroApi {
     _lib: libloading::Library, // for tying our lifetime to its own
diff --git a/ferretro_base/src/retro/wrapped_types.rs b/ferretro_base/src/retro/wrapped_types.rs
index b96dcdb..22444ea 100644
--- a/ferretro_base/src/retro/wrapped_types.rs
+++ b/ferretro_base/src/retro/wrapped_types.rs
@@ -108,7 +108,7 @@ impl<D> TryFrom<(D, c_uint)> for InputDeviceId
     where D: TryInto<DeviceType>,
           <D as std::convert::TryInto<DeviceType>>::Error: std::error::Error + Send + Sync + 'static,
 {
-    type Error = Box<dyn std::error::Error>;
+    type Error = Box<dyn std::error::Error + Send + Sync>;
 
     fn try_from(pair: (D, c_uint)) -> Result<Self, Self::Error> {
         let (device, id) = pair;
diff --git a/ferretro_components/src/base/mod.rs b/ferretro_components/src/base/mod.rs
index 22b950b..a66b18d 100644
--- a/ferretro_components/src/base/mod.rs
+++ b/ferretro_components/src/base/mod.rs
@@ -40,13 +40,15 @@ pub struct RetroComponentBase {
     _temp_dir: tempfile::TempDir,
 }
 
+unsafe impl Send for RetroComponentBase {}
+
 // TODO: replace with std::ops::ControlFlow when it becomes stable
 pub enum ControlFlow {
     Continue,
     Break,
 }
 
-pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
 
 #[rustfmt::skip]
 #[allow(unused_variables)]
diff --git a/ferretro_components/src/provided/sdl2/audio.rs b/ferretro_components/src/provided/sdl2/audio.rs
index 07d7674..64b38e6 100644
--- a/ferretro_components/src/provided/sdl2/audio.rs
+++ b/ferretro_components/src/provided/sdl2/audio.rs
@@ -61,7 +61,7 @@ impl RetroCallbacks for SimpleSdl2AudioComponent {
 }
 
 impl RetroComponent for SimpleSdl2AudioComponent {
-    fn post_load_game(&mut self, retro: &mut LibretroWrapper, _rom: &Path) -> Result<(), Box<dyn Error>> {
+    fn post_load_game(&mut self, retro: &mut LibretroWrapper, _rom: &Path) -> Result<(), Box<dyn Error + Send + Sync>> {
         self.src_freq = retro.get_system_av_info().timing.sample_rate;
         self.queue.resume();
         self.started = false;
@@ -83,7 +83,7 @@ impl RetroComponent for SimpleSdl2AudioComponent {
 }
 
 impl SimpleSdl2AudioComponent {
-    pub fn new(sdl_context: &mut Sdl) -> Result<Self, Box<dyn std::error::Error>> {
+    pub fn new(sdl_context: &mut Sdl) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
         let audio = sdl_context.audio().unwrap();
         let desired_spec = AudioSpecDesired {
             freq: None,
diff --git a/ferretro_components/src/provided/sdl2/audio_ratecontrol.rs b/ferretro_components/src/provided/sdl2/audio_ratecontrol.rs
index f2947dd..e464355 100644
--- a/ferretro_components/src/provided/sdl2/audio_ratecontrol.rs
+++ b/ferretro_components/src/provided/sdl2/audio_ratecontrol.rs
@@ -33,7 +33,7 @@ impl RetroCallbacks for Sdl2RateControlledAudioComponent {
 }
 
 impl RetroComponent for Sdl2RateControlledAudioComponent {
-    fn post_load_game(&mut self, _retro: &mut LibretroWrapper, _rom: &Path) -> Result<(), Box<dyn Error>> {
+    fn post_load_game(&mut self, _retro: &mut LibretroWrapper, _rom: &Path) -> Result<(), Box<dyn Error + Send + Sync>> {
         self.queue.resume();
         Ok(())
     }
diff --git a/ferretro_components/src/provided/sdl2/gamepad.rs b/ferretro_components/src/provided/sdl2/gamepad.rs
index 2361de5..36db3fc 100644
--- a/ferretro_components/src/provided/sdl2/gamepad.rs
+++ b/ferretro_components/src/provided/sdl2/gamepad.rs
@@ -98,7 +98,7 @@ impl RetroComponent for SimpleSdl2GamepadComponent {
         ControlFlow::Continue
     }
 
-    fn post_load_game(&mut self, retro: &mut LibretroWrapper, _rom: &Path) -> Result<(), Box<dyn Error>> {
+    fn post_load_game(&mut self, retro: &mut LibretroWrapper, _rom: &Path) -> Result<(), Box<dyn Error + Send + Sync>> {
         if let Some(device) = self.preferred_pad {
             for port in 0..self.gamepads.len() as u32 {
                 retro.set_controller_port_device(port, device);
diff --git a/ferretro_components/src/provided/sdl2/opengl.rs b/ferretro_components/src/provided/sdl2/opengl.rs
index c18b344..bc20276 100644
--- a/ferretro_components/src/provided/sdl2/opengl.rs
+++ b/ferretro_components/src/provided/sdl2/opengl.rs
@@ -28,7 +28,7 @@ pub struct SimpleSdl2OpenglComponent {
 }
 
 impl SimpleSdl2OpenglComponent {
-    pub fn new(sdl_context: &mut Sdl, retro: &LibretroWrapper) -> Result<Self, Box<dyn std::error::Error>> {
+    pub fn new(sdl_context: &mut Sdl, retro: &LibretroWrapper) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
         let sys_info = retro.get_system_info();
         let title = format!(
             "{} - ferretro SDL GL",
diff --git a/ferretro_components/src/provided/sdl2/surface.rs b/ferretro_components/src/provided/sdl2/surface.rs
index 8e52968..2f58763 100644
--- a/ferretro_components/src/provided/sdl2/surface.rs
+++ b/ferretro_components/src/provided/sdl2/surface.rs
@@ -9,7 +9,7 @@ pub struct Sdl2SurfaceComponent {
 }
 
 impl Sdl2SurfaceComponent {
-    pub fn new() -> Result<Self, Box<dyn std::error::Error>> {
+    pub fn new() -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
         let pixel_format = sdl2::pixels::PixelFormatEnum::ARGB1555;
 
         // automatically replaced in video_refresh whenever size doesn't match