diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c b/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c
index c1fc33538f..b65d29485b 100644
--- a/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c
+++ b/CryptoPkg/Library/BaseCryptLib/SysCall/CrtWrapper.c
@@ -494,7 +494,9 @@ BIO_snprintf (
   ...
   )
 {
-  return 0;
+  // Because the function does not actually print anything to buf, it returns -1 as error.
+  // Otherwise, the consumer may think that the buf is valid and parse the buffer.
+  return -1;
 }
 
 #ifdef __GNUC__