diff --git a/ext/pcntl/pcntl.c b/ext/pcntl/pcntl.c
index 2034ca80b05b8..32eae167c9f6b 100644
--- a/ext/pcntl/pcntl.c
+++ b/ext/pcntl/pcntl.c
@@ -1733,6 +1733,7 @@ PHP_FUNCTION(pcntl_setcpuaffinity)
 
 		if (cpu < 0 || cpu >= maxcpus) {
 			zend_argument_value_error(2, "cpu id must be between 0 and " ZEND_ULONG_FMT " (" ZEND_LONG_FMT ")", maxcpus, cpu);
+			PCNTL_CPU_DESTROY(mask);
 			RETURN_THROWS();
 		}