diff --git a/ext/openssl/openssl.c b/ext/openssl/openssl.c
index 12383ac8c2c8..e22de83a46a1 100644
--- a/ext/openssl/openssl.c
+++ b/ext/openssl/openssl.c
@@ -2206,7 +2206,7 @@ PHP_FUNCTION(openssl_x509_parse)
 	for (i = 0; i < X509_PURPOSE_get_count(); i++) {
 		int id, purpset;
 		char * pname;
-		X509_PURPOSE * purp;
+		const X509_PURPOSE * purp;
 		zval subsub;
 
 		array_init(&subsub);