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-rw-r--r--objectivec/GPBUtilities.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/objectivec/GPBUtilities.h b/objectivec/GPBUtilities.h
index 1301b436..5b55104b 100644
--- a/objectivec/GPBUtilities.h
+++ b/objectivec/GPBUtilities.h
@@ -44,7 +44,7 @@ NS_ASSUME_NONNULL_BEGIN
// most likely won't exactly match the original .proto file.
NSString *GPBTextFormatForMessage(GPBMessage *message,
NSString * __nullable lineIndent);
-NSString *GPBTextFormatForUnknownFieldSet(GPBUnknownFieldSet *unknownSet,
+NSString *GPBTextFormatForUnknownFieldSet(GPBUnknownFieldSet * __nullable unknownSet,
NSString * __nullable lineIndent);
//