Fix compilation on PHP<7.2

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sp_php_compat.h b/src/sp_php_compat.h
index 04914b4..2334f62 100644
--- a/src/sp_php_compat.h
+++ b/src/sp_php_compat.h
@@ -111,7 +111,7 @@ static inline void php_hash_string_xor_char(unsigned char *out, const unsigned c
 
 static inline void php_hash_hmac_prep_key(unsigned char *K, const php_hash_ops *ops, void *context, const unsigned char *key, const size_t key_len) {
         memset(K, 0, ops->block_size);
-        if (key_len > ops->block_size) {
+        if (key_len > (size_t)ops->block_size) {
                 /* Reduce the key first */
 #if PHP_VERSION_ID < 80100
                 ops->hash_init(context);