diff --git a/crypto/src/main/java/org/springframework/security/crypto/bcrypt/BCrypt.java b/crypto/src/main/java/org/springframework/security/crypto/bcrypt/BCrypt.java
index d91dd5caed..80477c0f56 100644
--- a/crypto/src/main/java/org/springframework/security/crypto/bcrypt/BCrypt.java
+++ b/crypto/src/main/java/org/springframework/security/crypto/bcrypt/BCrypt.java
@@ -543,7 +543,7 @@ public class BCrypt {
 		StringBuilder rs = new StringBuilder();
 
 		if (salt == null) {
-			throw new IllegalArgumentException("Invalid salt");
+			throw new IllegalArgumentException("salt cannot be null");
 		}
 
 		int saltLength = salt.length();