diff --git a/src/include/common/sha2.h b/src/include/common/sha2.h
index f4bae35af1..dfeee6bceb 100644
--- a/src/include/common/sha2.h
+++ b/src/include/common/sha2.h
@@ -18,15 +18,11 @@
 /*** SHA224/256/384/512 Various Length Definitions ***********************/
 #define PG_SHA224_BLOCK_LENGTH			64
 #define PG_SHA224_DIGEST_LENGTH			28
-#define PG_SHA224_DIGEST_STRING_LENGTH	(PG_SHA224_DIGEST_LENGTH * 2 + 1)
 #define PG_SHA256_BLOCK_LENGTH			64
 #define PG_SHA256_DIGEST_LENGTH			32
-#define PG_SHA256_DIGEST_STRING_LENGTH	(PG_SHA256_DIGEST_LENGTH * 2 + 1)
 #define PG_SHA384_BLOCK_LENGTH			128
 #define PG_SHA384_DIGEST_LENGTH			48
-#define PG_SHA384_DIGEST_STRING_LENGTH	(PG_SHA384_DIGEST_LENGTH * 2 + 1)
 #define PG_SHA512_BLOCK_LENGTH			128
 #define PG_SHA512_DIGEST_LENGTH			64
-#define PG_SHA512_DIGEST_STRING_LENGTH	(PG_SHA512_DIGEST_LENGTH * 2 + 1)
 
 #endif							/* _PG_SHA2_H_ */