diff --git a/Cargo.lock b/Cargo.lock
index 61bdd97..cb79ad5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -187,7 +187,7 @@ dependencies = [
 [[package]]
 name = "ffmpeg-sys-the-third"
 version = "2.1.0+ffmpeg-7.1"
-source = "git+https://git.v0l.io/Kieran/ffmpeg-the-third.git#e5f8e077b04b10d5887bce4df1eb1a71738a6c66"
+source = "git+https://git.v0l.io/Kieran/ffmpeg-the-third.git?rev=e5f8e077b04b10d5887bce4df1eb1a71738a6c66#e5f8e077b04b10d5887bce4df1eb1a71738a6c66"
 dependencies = [
  "bindgen",
  "cc",
diff --git a/Cargo.toml b/Cargo.toml
index aeb4b5c..8c599d8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ crate-type = ["lib", "cdylib"]
 
 [dependencies]
 anyhow = "1.0.91"
-ffmpeg-sys-the-third = { git = "https://git.v0l.io/Kieran/ffmpeg-the-third.git", ref = "e5f8e077b04b10d5887bce4df1eb1a71738a6c66", package = "ffmpeg-sys-the-third" }
+ffmpeg-sys-the-third = { git = "https://git.v0l.io/Kieran/ffmpeg-the-third.git", rev = "e5f8e077b04b10d5887bce4df1eb1a71738a6c66", package = "ffmpeg-sys-the-third" }
 libc = { version = "0.2.160" }
 slimbox = "0.1.0"
 log = "0.4.22"
diff --git a/build.rs b/build.rs
index 902bfa8..eedefd3 100644
--- a/build.rs
+++ b/build.rs
@@ -4,15 +4,13 @@ fn main() {
     // re-export ffmpeg-sys-the-third features
     // https://github.com/FFmpeg/FFmpeg/blob/master/doc/APIchanges
     for (name, _value) in env::vars() {
-        if name.starts_with("DEP_FFMPEG_CHECK_") {
+        if name.starts_with("DEP_FFMPEG_") && !name.starts_with("DEP_FFMPEG_CHECK_") {
+            let feature_name = name["DEP_FFMPEG_".len()..name.len()].to_lowercase();
+            println!(r#"cargo::rustc-check-cfg=cfg(feature, values("{feature_name}"))"#);
+            println!(r#"cargo::rustc-cfg=feature="{feature_name}""#);
             println!(
-                r#"cargo:rustc-check-cfg=cfg(feature, values("{}"))"#,
-                name["DEP_FFMPEG_CHECK_".len()..name.len()].to_lowercase()
-            );
-        } else if name.starts_with("DEP_FFMPEG_") {
-            println!(
-                r#"cargo:rustc-cfg=feature="{}""#,
-                name["DEP_FFMPEG_".len()..name.len()].to_lowercase()
+                r#"cargo::rustc-env=DEP_FFMPEG_{}=1"#,
+                feature_name.to_uppercase()
             );
         }
     }