diff --git a/src/decoder.rs b/src/decoder.rs
index a6800b4..71dff97 100644
--- a/src/decoder.rs
+++ b/src/decoder.rs
@@ -185,6 +185,8 @@ struct DecoderWrapper {
     options: Pin<Box<webp::WebPAnimDecoderOptions>>,
 }
 
+unsafe impl Send for DecoderWrapper {}
+
 impl DecoderWrapper {
     pub fn new(
         data: Pin<Box<webp::WebPData>>,
diff --git a/src/encoder.rs b/src/encoder.rs
index 369ee23..85b092c 100644
--- a/src/encoder.rs
+++ b/src/encoder.rs
@@ -279,6 +279,8 @@ struct EncoderWrapper {
     options: Pin<Box<webp::WebPAnimEncoderOptions>>,
 }
 
+unsafe impl Send for EncoderWrapper {}
+
 impl EncoderWrapper {
     pub fn new(
         dimensions: (u32, u32),