diff --git a/src/libstrongswan/plugins/pkcs7/pkcs7_encrypted_data.c b/src/libstrongswan/plugins/pkcs7/pkcs7_encrypted_data.c
index 1c900ddcc..472e72e2a 100644
--- a/src/libstrongswan/plugins/pkcs7/pkcs7_encrypted_data.c
+++ b/src/libstrongswan/plugins/pkcs7/pkcs7_encrypted_data.c
@@ -170,7 +170,7 @@ METHOD(container_t, get_encoding, bool,
 METHOD(container_t, destroy, void,
 	private_pkcs7_encrypted_data_t *this)
 {
-	free(this->content.ptr);
+	chunk_clear(&this->content);
 	free(this->encoding.ptr);
 	free(this);
 }
diff --git a/src/libstrongswan/plugins/pkcs7/pkcs7_enveloped_data.c b/src/libstrongswan/plugins/pkcs7/pkcs7_enveloped_data.c
index 14bfaf377..8b26bad3a 100644
--- a/src/libstrongswan/plugins/pkcs7/pkcs7_enveloped_data.c
+++ b/src/libstrongswan/plugins/pkcs7/pkcs7_enveloped_data.c
@@ -359,7 +359,7 @@ METHOD(container_t, get_encoding, bool,
 METHOD(container_t, destroy, void,
 	private_pkcs7_enveloped_data_t *this)
 {
-	free(this->content.ptr);
+	chunk_clear(&this->content);
 	free(this->encoding.ptr);
 	free(this);
 }