diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 47a1be68f7..b5d4534c0b 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -941,6 +941,8 @@ def CommonChecks(input_api, output_api):
       input_api, output_api, non_third_party_sources))
   results.extend(CheckBannedAbslMakeUnique(
       input_api, output_api, non_third_party_sources))
+  results.extend(CheckObjcApiSymbols(
+      input_api, output_api, non_third_party_sources))
   return results
 
 
@@ -1017,6 +1019,35 @@ def CheckBannedAbslMakeUnique(input_api, output_api, source_file_filter):
         files)]
   return []
 
+def CheckObjcApiSymbols(input_api, output_api, source_file_filter):
+  rtc_objc_export = re.compile(r'RTC_OBJC_EXPORT(.|\n){26}',
+                               re.MULTILINE | re.DOTALL)
+  file_filter = lambda f: (f.LocalPath().endswith(('.h'))
+                           and source_file_filter(f))
+
+  files = []
+  file_filter = lambda x: (input_api.FilterSourceFile(x)
+                           and source_file_filter(x))
+  for f in input_api.AffectedSourceFiles(file_filter):
+    if not f.LocalPath().endswith('.h') or not 'sdk/objc' in f.LocalPath():
+      continue
+    contents = input_api.ReadFile(f)
+    for match in rtc_objc_export.finditer(contents):
+      export_block = match.group(0)
+      if 'RTC_OBJC_TYPE' not in export_block:
+        files.append(f.LocalPath())
+
+  if len(files):
+    return [output_api.PresubmitError(
+        'RTC_OBJC_EXPORT types must be wrapped into an RTC_OBJC_TYPE() ' +
+        'macro.\n\n' +
+        'For example:\n' +
+        'RTC_OBJC_EXPORT @protocol RTC_OBJC_TYPE(RtcFoo)\n\n' +
+        'RTC_OBJC_EXPORT @interface RTC_OBJC_TYPE(RtcFoo)\n\n' +
+        'Please fix the following files:',
+        files)]
+  return []
+
 def CheckAbslMemoryInclude(input_api, output_api, source_file_filter):
   pattern = input_api.re.compile(
       r'^#include\s*"absl/memory/memory.h"', input_api.re.MULTILINE)
diff --git a/sdk/objc/api/peerconnection/RTCRtpSender.h b/sdk/objc/api/peerconnection/RTCRtpSender.h
index 41bb083d2e..fcdf199869 100644
--- a/sdk/objc/api/peerconnection/RTCRtpSender.h
+++ b/sdk/objc/api/peerconnection/RTCRtpSender.h
@@ -21,8 +21,8 @@ RTC_OBJC_EXPORT
 @protocol RTC_OBJC_TYPE
 (RTCRtpSender)<NSObject>
 
-    /** A unique identifier for this sender. */
-    @property(nonatomic, readonly) NSString *senderId;
+/** A unique identifier for this sender. */
+@property(nonatomic, readonly) NSString *senderId;
 
 /** The currently active RTCRtpParameters, as defined in
  *  https://www.w3.org/TR/webrtc/#idl-def-RTCRtpParameters.