diff --git a/pyo3-build-config/src/impl_.rs b/pyo3-build-config/src/impl_.rs
index d38d41ed552..3dc1e912447 100644
--- a/pyo3-build-config/src/impl_.rs
+++ b/pyo3-build-config/src/impl_.rs
@@ -996,7 +996,6 @@ pub enum BuildFlag {
     Py_DEBUG,
     Py_REF_DEBUG,
     Py_TRACE_REFS,
-    Py_GIL_DISABLED,
     COUNT_ALLOCS,
     Other(String),
 }
@@ -1017,7 +1016,6 @@ impl FromStr for BuildFlag {
             "Py_DEBUG" => Ok(BuildFlag::Py_DEBUG),
             "Py_REF_DEBUG" => Ok(BuildFlag::Py_REF_DEBUG),
             "Py_TRACE_REFS" => Ok(BuildFlag::Py_TRACE_REFS),
-            "Py_GIL_DISABLED" => Ok(BuildFlag::Py_GIL_DISABLED),
             "COUNT_ALLOCS" => Ok(BuildFlag::COUNT_ALLOCS),
             other => Ok(BuildFlag::Other(other.to_owned())),
         }
@@ -1041,11 +1039,10 @@ impl FromStr for BuildFlag {
 pub struct BuildFlags(pub HashSet<BuildFlag>);
 
 impl BuildFlags {
-    const ALL: [BuildFlag; 5] = [
+    const ALL: [BuildFlag; 4] = [
         BuildFlag::Py_DEBUG,
         BuildFlag::Py_REF_DEBUG,
         BuildFlag::Py_TRACE_REFS,
-        BuildFlag::Py_GIL_DISABLED,
         BuildFlag::COUNT_ALLOCS,
     ];
 
diff --git a/pyo3-ffi/build.rs b/pyo3-ffi/build.rs
index 83408b31222..25f2ca1733d 100644
--- a/pyo3-ffi/build.rs
+++ b/pyo3-ffi/build.rs
@@ -125,7 +125,7 @@ fn ensure_gil_enabled(interpreter_config: &InterpreterConfig) -> Result<()> {
     let gil_enabled = interpreter_config
         .build_flags
         .0
-        .contains(&BuildFlag::Py_GIL_DISABLED)
+        .contains(&BuildFlag::Other("Py_GIL_DISABLED".to_string()))
         .not();
     ensure!(
         gil_enabled || std::env::var("UNSAFE_PYO3_BUILD_FREE_THREADED").map_or(false, |os_str| os_str == "1"),