diff --git a/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm b/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm
index 13699de511ee..f3fcde598d16 100644
--- a/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm
+++ b/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm
@@ -1033,7 +1033,7 @@ - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didFini
     }
 }
 
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveInformationalResponse:(NSURLResponse *)response
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveInformationalResponse:(NSHTTPURLResponse *)response
 {
     if (auto* networkDataTask = [self existingTask:task]) {
         ASSERT(RunLoop::isMain());
@@ -1046,7 +1046,8 @@ - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didRece
 // FIXME: Remove when rdar://108002223 can be resolved.
 - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task _didReceiveInformationalResponse:(NSURLResponse *)response
 {
-    [self URLSession:session task:task didReceiveInformationalResponse:response];
+    if ([response isKindOfClass:[NSHTTPURLResponse class]])
+        [self URLSession:session task:task didReceiveInformationalResponse:(NSHTTPURLResponse *)response];
 }
 
 - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler