diff --git a/ext/pcntl/php_pcntl.h b/ext/pcntl/php_pcntl.h
index e190767a6dd..a16b3e0f47e 100644
--- a/ext/pcntl/php_pcntl.h
+++ b/ext/pcntl/php_pcntl.h
@@ -48,7 +48,7 @@ ZEND_BEGIN_MODULE_GLOBALS(pcntl)
 	int last_error;
 	volatile bool pending_signals;
 	bool async_signals;
-	unsigned num_signals;
+	uint8_t num_signals;
 ZEND_END_MODULE_GLOBALS(pcntl)
 
 #if defined(ZTS) && defined(COMPILE_DL_PCNTL)