diff --git a/ext/pdo_firebird/firebird_statement.c b/ext/pdo_firebird/firebird_statement.c
index 5eaf530415a..5445368bc9f 100644
--- a/ext/pdo_firebird/firebird_statement.c
+++ b/ext/pdo_firebird/firebird_statement.c
@@ -529,7 +529,7 @@ static int firebird_stmt_param_hook(pdo_stmt_t *stmt, struct pdo_bound_param_dat
 				if (stm) {
 					zend_string *mem =  php_stream_copy_to_mem(stm, PHP_STREAM_COPY_ALL, 0);
 					zval_ptr_dtor(parameter);
-					ZVAL_STR(parameter, mem ? mem : STR_EMPTY_ALLOC());
+					ZVAL_STR(parameter, mem ? mem : ZSTR_EMPTY_ALLOC());
 				} else {
 					pdo_raise_impl_error(stmt->dbh, stmt, "HY105", "Expected a stream resource");
 					return 0;
diff --git a/ext/pdo_mysql/mysql_statement.c b/ext/pdo_mysql/mysql_statement.c
index ac94632aae8..2c7e39bbbda 100644
--- a/ext/pdo_mysql/mysql_statement.c
+++ b/ext/pdo_mysql/mysql_statement.c
@@ -528,7 +528,7 @@ static int pdo_mysql_stmt_param_hook(pdo_stmt_t *stmt, struct pdo_bound_param_da
 							if (stm) {
 								zend_string *mem = php_stream_copy_to_mem(stm, PHP_STREAM_COPY_ALL, 0);
 								zval_ptr_dtor(parameter);
-								ZVAL_STR(parameter, mem ? mem : STR_EMPTY_ALLOC());
+								ZVAL_STR(parameter, mem ? mem : ZSTR_EMPTY_ALLOC());
 							} else {
 								pdo_raise_impl_error(stmt->dbh, stmt, "HY105", "Expected a stream resource");
 								return 0;
diff --git a/ext/pdo_sqlite/sqlite_statement.c b/ext/pdo_sqlite/sqlite_statement.c
index 93807c834ca..efe84c11cd6 100644
--- a/ext/pdo_sqlite/sqlite_statement.c
+++ b/ext/pdo_sqlite/sqlite_statement.c
@@ -143,7 +143,7 @@ static int pdo_sqlite_stmt_param_hook(pdo_stmt_t *stmt, struct pdo_bound_param_d
 							if (stm) {
 								zend_string *mem = php_stream_copy_to_mem(stm, PHP_STREAM_COPY_ALL, 0);
 								zval_ptr_dtor(parameter);
-								ZVAL_STR(parameter, mem ? mem : STR_EMPTY_ALLOC());
+								ZVAL_STR(parameter, mem ? mem : ZSTR_EMPTY_ALLOC());
 							} else {
 								pdo_raise_impl_error(stmt->dbh, stmt, "HY105", "Expected a stream resource");
 								return 0;