diff --git a/Sources/SwiftIfConfig/BuildConfiguration.swift b/Sources/SwiftIfConfig/BuildConfiguration.swift
index dfa90599340..51daaaeac84 100644
--- a/Sources/SwiftIfConfig/BuildConfiguration.swift
+++ b/Sources/SwiftIfConfig/BuildConfiguration.swift
@@ -39,11 +39,14 @@ public enum CanImportVersion {
 
 enum BuildConfigurationError: Error, CustomStringConvertible {
   case experimentalFeature(name: String)
+  case notImplemented(name: String)
 
   var description: String {
     switch self {
     case .experimentalFeature(let name):
       return "'\(name)' is an experimental feature"
+    case .notImplemented(let name):
+      return "'\(name)' not implemented"
     }
   }
 }
@@ -228,18 +231,17 @@ public protocol BuildConfiguration {
   /// Determine whether the given name is the active target object file format (e.g., ELF).
   ///
   /// The target object file format can only be queried by an experimental
-  /// syntax `_objectFileFormat(<name>)`, e.g.,
+  /// syntax `objectFormat(<name>)`, e.g.,
   ///
   /// ```swift
-  /// #if _objectFileFormat(ELF)
+  /// #if objectFormat(ELF)
   /// // Special logic for ELF object file formats
   /// #endif
   /// ```
   /// - Parameters:
   ///   - name: The name of the object file format.
   /// - Returns: Whether the target object file format matches the given name.
-  @_spi(ExperimentalLanguageFeatures)
-  func isActiveTargetObjectFileFormat(name: String) throws -> Bool
+  func isActiveTargetObjectFormat(name: String) throws -> Bool
 
   /// The bit width of a data pointer for the target architecture.
   ///
@@ -307,9 +309,8 @@ public protocol BuildConfiguration {
 /// Default implementation of BuildConfiguration, to avoid a revlock with the
 /// swift repo, and breaking clients with the new addition to the protocol.
 extension BuildConfiguration {
-  /// FIXME: This should be @_spi(ExperimentalLanguageFeatures) but cannot due
-  /// to rdar://147943518, https://github.com/swiftlang/swift/issues/80313
-  public func isActiveTargetObjectFileFormat(name: String) throws -> Bool {
-    throw BuildConfigurationError.experimentalFeature(name: "_objectFileFormat")
+  @available(*, deprecated, message: "`BuildConfiguration` conformance must implement `isActiveTargetObjectFormat`")
+  public func isActiveTargetObjectFormat(name: String) throws -> Bool {
+    throw BuildConfigurationError.notImplemented(name: "isActiveTargetObjectFormat")
   }
 }
diff --git a/Sources/SwiftIfConfig/IfConfigEvaluation.swift b/Sources/SwiftIfConfig/IfConfigEvaluation.swift
index 3abb915f3bc..50c28802544 100644
--- a/Sources/SwiftIfConfig/IfConfigEvaluation.swift
+++ b/Sources/SwiftIfConfig/IfConfigEvaluation.swift
@@ -307,8 +307,8 @@ func evaluateIfConfig(
     case .targetEnvironment:
       return doSingleIdentifierArgumentCheck(configuration.isActiveTargetEnvironment, role: "environment")
 
-    case ._objectFileFormat:
-      return doSingleIdentifierArgumentCheck(configuration.isActiveTargetObjectFileFormat, role: "object file format")
+    case .objectFormat:
+      return doSingleIdentifierArgumentCheck(configuration.isActiveTargetObjectFormat, role: "object file format")
 
     case ._runtime:
       return doSingleIdentifierArgumentCheck(configuration.isActiveTargetRuntime, role: "runtime")
@@ -821,8 +821,8 @@ private struct CanImportSuppressingBuildConfiguration<Other: BuildConfiguration>
     return try other.isActiveTargetPointerAuthentication(name: name)
   }
 
-  func isActiveTargetObjectFileFormat(name: String) throws -> Bool {
-    return try other.isActiveTargetObjectFileFormat(name: name)
+  func isActiveTargetObjectFormat(name: String) throws -> Bool {
+    return try other.isActiveTargetObjectFormat(name: name)
   }
 
   var targetPointerBitWidth: Int { return other.targetPointerBitWidth }
diff --git a/Sources/SwiftIfConfig/IfConfigFunctions.swift b/Sources/SwiftIfConfig/IfConfigFunctions.swift
index f129af35ca4..66407751360 100644
--- a/Sources/SwiftIfConfig/IfConfigFunctions.swift
+++ b/Sources/SwiftIfConfig/IfConfigFunctions.swift
@@ -50,7 +50,7 @@ enum IfConfigFunctions: String {
   case _pointerBitWidth
 
   /// A check for the target object file format (e.g., ELF)
-  case _objectFileFormat
+  case objectFormat
 
   /// A check for the target runtime paired with the Swift runtime (e.g., _ObjC)
   /// via `_runtime(<name>)`.
@@ -72,7 +72,7 @@ enum IfConfigFunctions: String {
       return true
 
     case .hasAttribute, .hasFeature, .canImport, .os, .arch, .targetEnvironment,
-      ._hasAtomicBitWidth, ._endian, ._pointerBitWidth, ._objectFileFormat, ._runtime, ._ptrauth, .defined:
+      ._hasAtomicBitWidth, ._endian, ._pointerBitWidth, .objectFormat, ._runtime, ._ptrauth, .defined:
       return false
     }
   }
diff --git a/Sources/SwiftIfConfig/StaticBuildConfiguration.swift b/Sources/SwiftIfConfig/StaticBuildConfiguration.swift
index 1af7cffda07..f15ffdd3f06 100644
--- a/Sources/SwiftIfConfig/StaticBuildConfiguration.swift
+++ b/Sources/SwiftIfConfig/StaticBuildConfiguration.swift
@@ -413,8 +413,7 @@ extension StaticBuildConfiguration: BuildConfiguration {
   /// - Parameters:
   ///   - name: The name of the object file format.
   /// - Returns: Whether the target object file format matches the given name.
-  @_spi(ExperimentalLanguageFeatures)
-  public func isActiveTargetObjectFileFormat(name: String) -> Bool {
+  public func isActiveTargetObjectFormat(name: String) -> Bool {
     targetObjectFileFormats.contains(name)
   }
 
diff --git a/Tests/SwiftIfConfigTest/EvaluateTests.swift b/Tests/SwiftIfConfigTest/EvaluateTests.swift
index 849806dd218..82b85c1f49e 100644
--- a/Tests/SwiftIfConfigTest/EvaluateTests.swift
+++ b/Tests/SwiftIfConfigTest/EvaluateTests.swift
@@ -228,8 +228,8 @@ public class EvaluateTests: XCTestCase {
     assertIfConfig("_pointerBitWidth(_32)", .inactive)
     assertIfConfig("_hasAtomicBitWidth(_64)", .active)
     assertIfConfig("_hasAtomicBitWidth(_128)", .inactive)
-    assertIfConfig("_objectFileFormat(ELF)", .active)
-    assertIfConfig("_objectFileFormat(MachO)", .inactive)
+    assertIfConfig("objectFormat(ELF)", .active)
+    assertIfConfig("objectFormat(MachO)", .inactive)
 
     assertIfConfig(
       "_endian(mid)",
diff --git a/Tests/SwiftIfConfigTest/TestingBuildConfiguration.swift b/Tests/SwiftIfConfigTest/TestingBuildConfiguration.swift
index 1cc40f1f3bf..a4724ccc84e 100644
--- a/Tests/SwiftIfConfigTest/TestingBuildConfiguration.swift
+++ b/Tests/SwiftIfConfigTest/TestingBuildConfiguration.swift
@@ -99,7 +99,7 @@ struct TestingBuildConfiguration: BuildConfiguration {
     name == "arm64e"
   }
 
-  func isActiveTargetObjectFileFormat(name: String) throws -> Bool {
+  func isActiveTargetObjectFormat(name: String) throws -> Bool {
     name == "ELF"
   }