diff --git a/objectivec/GPBUnknownField.h b/objectivec/GPBUnknownField.h
index a135cc2031..5b96023b16 100644
--- a/objectivec/GPBUnknownField.h
+++ b/objectivec/GPBUnknownField.h
@@ -42,6 +42,9 @@ NS_ASSUME_NONNULL_BEGIN
  **/
 @interface GPBUnknownField : NSObject<NSCopying>
 
+/** Initialize a field with the given number. */
+- (instancetype)initWithNumber:(int32_t)number;
+
 /** The field number the data is stored under. */
 @property(nonatomic, readonly, assign) int32_t number;
 
diff --git a/objectivec/GPBUnknownField_PackagePrivate.h b/objectivec/GPBUnknownField_PackagePrivate.h
index 1fbce0f954..2b4c789513 100644
--- a/objectivec/GPBUnknownField_PackagePrivate.h
+++ b/objectivec/GPBUnknownField_PackagePrivate.h
@@ -36,8 +36,6 @@
 
 @interface GPBUnknownField ()
 
-- (instancetype)initWithNumber:(int32_t)number;
-
 - (void)writeToOutput:(GPBCodedOutputStream *)output;
 - (size_t)serializedSize;