diff --git a/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c b/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
index 17b4e222..56933893 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
@@ -293,6 +293,7 @@ int decode_string(argon2_context *ctx, const char *str, argon2_type type) {
     ctx->adlen = 0;
     ctx->saltlen = 0;
     ctx->outlen = 0;
+    ctx->pwdlen = 0;
     if (type == Argon2_i) {
         CC("$argon2i");
     } else {