diff --git a/app/javascript/mastodon/components/gifv.jsx b/app/javascript/mastodon/components/gifv.jsx
deleted file mode 100644
index 1ce7e7c29b..0000000000
--- a/app/javascript/mastodon/components/gifv.jsx
+++ /dev/null
@@ -1,76 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-
-export default class GIFV extends React.PureComponent {
-
-  static propTypes = {
-    src: PropTypes.string.isRequired,
-    alt: PropTypes.string,
-    lang: PropTypes.string,
-    width: PropTypes.number,
-    height: PropTypes.number,
-    onClick: PropTypes.func,
-  };
-
-  state = {
-    loading: true,
-  };
-
-  handleLoadedData = () => {
-    this.setState({ loading: false });
-  };
-
-  componentWillReceiveProps (nextProps) {
-    if (nextProps.src !== this.props.src) {
-      this.setState({ loading: true });
-    }
-  }
-
-  handleClick = e => {
-    const { onClick } = this.props;
-
-    if (onClick) {
-      e.stopPropagation();
-      onClick();
-    }
-  };
-
-  render () {
-    const { src, width, height, alt, lang } = this.props;
-    const { loading } = this.state;
-
-    return (
-      <div className='gifv' style={{ position: 'relative' }}>
-        {loading && (
-          <canvas
-            width={width}
-            height={height}
-            role='button'
-            tabIndex={0}
-            aria-label={alt}
-            title={alt}
-            lang={lang}
-            onClick={this.handleClick}
-          />
-        )}
-
-        <video
-          src={src}
-          role='button'
-          tabIndex={0}
-          aria-label={alt}
-          title={alt}
-          lang={lang}
-          muted
-          loop
-          autoPlay
-          playsInline
-          onClick={this.handleClick}
-          onLoadedData={this.handleLoadedData}
-          style={{ position: loading ? 'absolute' : 'static', top: 0, left: 0 }}
-        />
-      </div>
-    );
-  }
-
-}
diff --git a/app/javascript/mastodon/components/gifv.tsx b/app/javascript/mastodon/components/gifv.tsx
new file mode 100644
index 0000000000..8968170c5f
--- /dev/null
+++ b/app/javascript/mastodon/components/gifv.tsx
@@ -0,0 +1,68 @@
+import React, { useCallback, useState } from 'react';
+
+type Props = {
+  src: string;
+  key: string;
+  alt?: string;
+  lang?: string;
+  width: number;
+  height: number;
+  onClick?: () => void;
+}
+
+export const GIFV: React.FC<Props> = ({
+  src,
+  alt,
+  lang,
+  width,
+  height,
+  onClick,
+})=> {
+  const [loading, setLoading] = useState(true);
+
+  const handleLoadedData: React.ReactEventHandler<HTMLVideoElement> = useCallback(() => {
+    setLoading(false);
+  }, [setLoading]);
+
+  const handleClick: React.MouseEventHandler = useCallback((e) => {
+    if (onClick) {
+      e.stopPropagation();
+      onClick();
+    }
+  }, [onClick]);
+
+  return (
+    <div className='gifv' style={{ position: 'relative' }}>
+      {loading && (
+        <canvas
+          width={width}
+          height={height}
+          role='button'
+          tabIndex={0}
+          aria-label={alt}
+          title={alt}
+          lang={lang}
+          onClick={handleClick}
+        />
+      )}
+
+      <video
+        src={src}
+        role='button'
+        tabIndex={0}
+        aria-label={alt}
+        title={alt}
+        lang={lang}
+        muted
+        loop
+        autoPlay
+        playsInline
+        onClick={handleClick}
+        onLoadedData={handleLoadedData}
+        style={{ position: loading ? 'absolute' : 'static', top: 0, left: 0 }}
+      />
+    </div>
+  );
+};
+
+export default GIFV;
diff --git a/app/javascript/mastodon/features/ui/components/focal_point_modal.jsx b/app/javascript/mastodon/features/ui/components/focal_point_modal.jsx
index 11c4c52375..2a1e4c8bbc 100644
--- a/app/javascript/mastodon/features/ui/components/focal_point_modal.jsx
+++ b/app/javascript/mastodon/features/ui/components/focal_point_modal.jsx
@@ -383,7 +383,7 @@ class FocalPointModal extends ImmutablePureComponent {
             {focals && (
               <div className={classNames('focal-point', { dragging })} ref={this.setRef} onMouseDown={this.handleMouseDown} onTouchStart={this.handleTouchStart}>
                 {media.get('type') === 'image' && <ImageLoader src={media.get('url')} width={width} height={height} alt='' />}
-                {media.get('type') === 'gifv' && <GIFV src={media.get('url')} width={width} height={height} />}
+                {media.get('type') === 'gifv' && <GIFV src={media.get('url')} key={media.get('url')} width={width} height={height} />}
 
                 <div className='focal-point__preview'>
                   <strong><FormattedMessage id='upload_modal.preview_label' defaultMessage='Preview ({ratio})' values={{ ratio: '16:9' }} /></strong>
diff --git a/app/javascript/mastodon/features/ui/components/media_modal.jsx b/app/javascript/mastodon/features/ui/components/media_modal.jsx
index 52bd754535..ec6ddc0e11 100644
--- a/app/javascript/mastodon/features/ui/components/media_modal.jsx
+++ b/app/javascript/mastodon/features/ui/components/media_modal.jsx
@@ -186,7 +186,7 @@ class MediaModal extends ImmutablePureComponent {
             src={image.get('url')}
             width={width}
             height={height}
-            key={image.get('preview_url')}
+            key={image.get('url')}
             alt={image.get('description')}
             lang={language}
             onClick={this.toggleNavigation}