diff --git a/quic/core/quic_framer.h b/quic/core/quic_framer.h
index a5891f0..33b9b37 100644
--- a/quic/core/quic_framer.h
+++ b/quic/core/quic_framer.h
@@ -1097,7 +1097,8 @@
 // contains additional error information that narrows down the exact error. If
 // the string is not found, or is not properly formed, it returns
 // ErrorCode::QUIC_IETF_GQUIC_ERROR_MISSING
-QuicErrorCode MaybeExtractQuicErrorCode(QuicStringPiece error_details);
+QUIC_EXPORT_PRIVATE QuicErrorCode
+MaybeExtractQuicErrorCode(QuicStringPiece error_details);
 
 }  // namespace quic
 
diff --git a/spdy/core/spdy_protocol.h b/spdy/core/spdy_protocol.h
index 2a521ab..38eab0f 100644
--- a/spdy/core/spdy_protocol.h
+++ b/spdy/core/spdy_protocol.h
@@ -286,7 +286,8 @@
 const char* ErrorCodeToString(SpdyErrorCode error_code);
 
 // Serialize |type| to string for logging/debugging.
-const char* WriteSchedulerTypeToString(WriteSchedulerType type);
+SPDY_EXPORT_PRIVATE const char* WriteSchedulerTypeToString(
+    WriteSchedulerType type);
 
 // Minimum size of a frame, in octets.
 const size_t kFrameMinimumSize = kFrameHeaderSize;