diff --git a/Source/WTF/wtf/PlatformUse.h b/Source/WTF/wtf/PlatformUse.h
index cb3dbebd4314..29c24e702b4f 100644
--- a/Source/WTF/wtf/PlatformUse.h
+++ b/Source/WTF/wtf/PlatformUse.h
@@ -372,10 +372,6 @@
 #define USE_NSVIEW_SEMANTICCONTEXT 1
 #endif
 
-#if PLATFORM(IOS) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 170000
-#define USE_MEDIAPARSERD 1
-#endif
-
 #if (PLATFORM(MAC) && __MAC_OS_X_VERSION_MIN_REQUIRED < 130000)
 #define USE_AVIF 1
 #endif
diff --git a/Source/WebCore/PAL/pal/spi/cocoa/AVFoundationSPI.h b/Source/WebCore/PAL/pal/spi/cocoa/AVFoundationSPI.h
index 4aa7a6ad853e..8d236a04615d 100644
--- a/Source/WebCore/PAL/pal/spi/cocoa/AVFoundationSPI.h
+++ b/Source/WebCore/PAL/pal/spi/cocoa/AVFoundationSPI.h
@@ -479,9 +479,3 @@ NS_ASSUME_NONNULL_BEGIN
 NS_ASSUME_NONNULL_END
 
 #endif // HAVE(AVSAMPLEBUFFERVIDEOOUTPUT)
-
-#if USE(MEDIAPARSERD)
-@interface AVStreamDataParser (SandboxedParsing)
-@property (nonatomic) BOOL preferSandboxedParsing;
-@end
-#endif
diff --git a/Source/WebCore/PAL/pal/spi/cocoa/AVStreamDataParserSPI.h b/Source/WebCore/PAL/pal/spi/cocoa/AVStreamDataParserSPI.h
index 921240b347c4..19686ae9a62b 100644
--- a/Source/WebCore/PAL/pal/spi/cocoa/AVStreamDataParserSPI.h
+++ b/Source/WebCore/PAL/pal/spi/cocoa/AVStreamDataParserSPI.h
@@ -70,4 +70,8 @@ typedef NS_ENUM(NSUInteger, AVStreamDataParserOutputMediaDataFlags) {
 @interface AVStreamDataParser (AVStreamDataParserContentKeyEligibility) <AVContentKeyRecipient>
 @end
 
+@interface AVStreamDataParser (AVStreamDataParserSandboxedParsing)
+@property (nonatomic) BOOL preferSandboxedParsing;
+@end
+
 NS_ASSUME_NONNULL_END