diff --git a/gnupg.c b/gnupg.c
index af20050..3ff4f09 100644
--- a/gnupg.c
+++ b/gnupg.c
@@ -395,14 +395,16 @@ PHP_MINFO_FUNCTION(gnupg)
 
 /* {{{ passphrase_cb */
 gpgme_error_t passphrase_cb(
-		PHPC_THIS_DECLARE(gnupg),
+		void *hook,
 		const char *uid_hint, const char *passphrase_info,
-		int last_was_bad, int fd TSRMLS_DC)
+		int last_was_bad, int fd)
 {
 	char uid[17];
 	int idx;
 	char *passphrase = NULL;
 	zval *return_value = NULL;
+	PHPC_THIS_DECLARE(gnupg) = hook;
+	TSRMLS_FETCH();
 
 	if (last_was_bad) {
 		GNUPG_ERR("Incorrent passphrase");
@@ -431,14 +433,16 @@ gpgme_error_t passphrase_cb(
 
 /* {{{ passphrase_decrypt_cb */
 gpgme_error_t passphrase_decrypt_cb (
-		PHPC_THIS_DECLARE(gnupg),
+		void *hook,
 		const char *uid_hint, const char *passphrase_info,
-		int last_was_bad, int fd TSRMLS_DC)
+		int last_was_bad, int fd)
 {
 	char uid[17];
 	int idx;
 	char *passphrase = NULL;
 	zval *return_value = NULL;
+	PHPC_THIS_DECLARE(gnupg) = hook;
+	TSRMLS_FETCH();
 
 	if (last_was_bad) {
 		GNUPG_ERR("Incorrent passphrase");
@@ -927,7 +931,7 @@ PHP_FUNCTION(gnupg_sign)
 		GNUPG_RES_FETCH();
 	}
 
-	gpgme_set_passphrase_cb(PHPC_THIS->ctx, (void *)passphrase_cb, PHPC_THIS);
+	gpgme_set_passphrase_cb(PHPC_THIS->ctx, passphrase_cb, PHPC_THIS);
 	if ((PHPC_THIS->err = gpgme_data_new_from_mem(&in, value, value_len, 0)) != GPG_ERR_NO_ERROR) {
 		GNUPG_ERR("could not create in-data buffer");
 		return;
@@ -1063,7 +1067,7 @@ PHP_FUNCTION(gnupg_encryptsign)
 		GNUPG_ERR("no key for encryption set");
 		return;
 	}
-	gpgme_set_passphrase_cb(PHPC_THIS->ctx, (void *)passphrase_cb, PHPC_THIS);
+	gpgme_set_passphrase_cb(PHPC_THIS->ctx, passphrase_cb, PHPC_THIS);
 	if ((PHPC_THIS->err = gpgme_data_new_from_mem (&in, value, value_len, 0)) != GPG_ERR_NO_ERROR) {
 		GNUPG_ERR("could not create in-data buffer");
 		return;
@@ -1227,7 +1231,7 @@ PHP_FUNCTION(gnupg_decrypt)
 		GNUPG_RES_FETCH();
 	}
 
-	gpgme_set_passphrase_cb(PHPC_THIS->ctx, (void *)passphrase_decrypt_cb, PHPC_THIS);
+	gpgme_set_passphrase_cb(PHPC_THIS->ctx, passphrase_decrypt_cb, PHPC_THIS);
 
 	if ((PHPC_THIS->err = gpgme_data_new_from_mem(&in, enctxt, enctxt_len, 0)) != GPG_ERR_NO_ERROR) {
 		GNUPG_ERR("could not create in-data buffer");
@@ -1291,7 +1295,7 @@ PHP_FUNCTION(gnupg_decryptverify)
 	}
 	PHPC_PZVAL_DEREF(plaintext);
 
-	gpgme_set_passphrase_cb(PHPC_THIS->ctx, (void *)passphrase_decrypt_cb, PHPC_THIS);
+	gpgme_set_passphrase_cb(PHPC_THIS->ctx, passphrase_decrypt_cb, PHPC_THIS);
 
 	if ((PHPC_THIS->err = gpgme_data_new_from_mem(&in, enctxt, enctxt_len, 0)) != GPG_ERR_NO_ERROR) {
 		GNUPG_ERR("could not create in-data buffer");