diff --git a/src/backend/access/transam/xlogreader.c b/src/backend/access/transam/xlogreader.c
index 67418b05f1..bc8156fcd6 100644
--- a/src/backend/access/transam/xlogreader.c
+++ b/src/backend/access/transam/xlogreader.c
@@ -70,7 +70,7 @@ report_invalid_record(XLogReaderState *state, const char *fmt,...)
  * Returns NULL if the xlogreader couldn't be allocated.
  */
 XLogReaderState *
-XLogReaderAllocate(int wal_segment_size, const char *waldir,
+XLogReaderAllocate(int wallog_segment_size, const char *waldir,
 				   XLogPageReadCB pagereadfunc, void *private_data)
 {
 	XLogReaderState *state;
@@ -99,7 +99,7 @@ XLogReaderAllocate(int wal_segment_size, const char *waldir,
 	}
 
 	/* Initialize segment info. */
-	WALOpenSegmentInit(&state->seg, &state->segcxt, wal_segment_size,
+	WALOpenSegmentInit(&state->seg, &state->segcxt, wallog_segment_size,
 					   waldir);
 
 	state->read_page = pagereadfunc;
diff --git a/src/include/access/xlogreader.h b/src/include/access/xlogreader.h
index 0193611b7f..d8991d1a79 100644
--- a/src/include/access/xlogreader.h
+++ b/src/include/access/xlogreader.h
@@ -209,7 +209,7 @@ struct XLogReaderState
 };
 
 /* Get a new XLogReader */
-extern XLogReaderState *XLogReaderAllocate(int wal_segment_size,
+extern XLogReaderState *XLogReaderAllocate(int wallog_segment_size,
 										   const char *waldir,
 										   XLogPageReadCB pagereadfunc,
 										   void *private_data);