diff --git a/CryptoPkg/Library/Include/CrtLibSupport.h b/CryptoPkg/Library/Include/CrtLibSupport.h
index b1db70a269..aed2193227 100644
--- a/CryptoPkg/Library/Include/CrtLibSupport.h
+++ b/CryptoPkg/Library/Include/CrtLibSupport.h
@@ -82,6 +82,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #define INT_MIN       (-INT_MAX-1)    /* Minimum (signed) int value */
 #define LONG_MAX      0X7FFFFFFFL     /* max value for a long */
 #define LONG_MIN      (-LONG_MAX-1)   /* min value for a long */
+#define UINT_MAX      0xFFFFFFFF      /* Maximum unsigned int value */
 #define ULONG_MAX     0xFFFFFFFF      /* Maximum unsigned long value */
 #define CHAR_BIT      8               /* Number of bits in a char */