diff --git a/src/modules/module_20200.c b/src/modules/module_20200.c
index 18b8c3f91..be3e4672b 100644
--- a/src/modules/module_20200.c
+++ b/src/modules/module_20200.c
@@ -200,7 +200,7 @@ int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
   tmp[7] = byte_swap_64 (digest[7]);
   tmp[8] = 0;
 
-  char salt_enc[256] = { 0 };
+  char salt_enc[257] = { 0 };
   char hash_enc[128] = { 0 };
 
   const size_t salt_len_enc = base64_encode (int_to_alternate_base64, (const u8 *) pbkdf2_sha512->salt_buf, salt->salt_len, (u8 *) salt_enc);
diff --git a/src/modules/module_20300.c b/src/modules/module_20300.c
index e8481bfe9..c19d1aa1f 100644
--- a/src/modules/module_20300.c
+++ b/src/modules/module_20300.c
@@ -199,7 +199,7 @@ int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
   tmp[7] = byte_swap_32 (digest[7]);
   tmp[8] = 0;
 
-  char salt_enc[256] = { 0 };
+  char salt_enc[257] = { 0 };
   char hash_enc[128] = { 0 };
 
   const size_t salt_len_enc = base64_encode (int_to_alternate_base64, (const u8 *) pbkdf2_sha256->salt_buf, salt->salt_len, (u8 *) salt_enc);
diff --git a/src/modules/module_20400.c b/src/modules/module_20400.c
index 7cfac4618..2bb91c24c 100644
--- a/src/modules/module_20400.c
+++ b/src/modules/module_20400.c
@@ -192,7 +192,7 @@ int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
   tmp[4] = byte_swap_32 (digest[4]);
   tmp[5] = 0;
 
-  char salt_enc[256] = { 0 };
+  char salt_enc[257] = { 0 };
   char hash_enc[128] = { 0 };
 
   const size_t salt_len_enc = base64_encode (int_to_alternate_base64, (const u8 *) pbkdf2_sha1->salt_buf, salt->salt_len, (u8 *) salt_enc);