#if PSI_THREADED_PARSER
# include <pthread.h>
-pthread_mutex_t psi_string_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t psi_string_mutex = PTHREAD_MUTEX_INITIALIZER;
zend_string *psi_string_init_interned(const char *buf, size_t len, int p)
{