--- src/engine-gpg.c
+++ src/engine-gpg.c
@@ -61,6 +61,15 @@
 		      building command line to this location.  */
   char arg[FLEXIBLE_ARRAY_MEMBER];     /* Used if data above is not used.  */
 };
+struct arg_without_data_s
+{
+  struct arg_and_data_s *next;
+  gpgme_data_t data;
+  int inbound;
+  int dup_to;
+  int print_fd;
+  int *arg_locp;
+};
 
 
 struct fd_data_map_s
@@ -310,23 +319,24 @@
   a = malloc (offsetof (struct arg_and_data_s, arg));
   if (!a)
     return gpg_error_from_syserror ();
-  a->next = NULL;
-  a->data = data;
-  a->inbound = inbound;
-  a->arg_locp = NULL;
+  struct arg_without_data_s *a2 = (struct arg_without_data_s *)a;
+  a2->next = NULL;
+  a2->data = data;
+  a2->inbound = inbound;
+  a2->arg_locp = NULL;
 
   if (dup_to == -2)
     {
-      a->print_fd = 1;
-      a->dup_to = -1;
+      a2->print_fd = 1;
+      a2->dup_to = -1;
     }
   else
     {
-      a->print_fd = 0;
-      a->dup_to = dup_to;
+      a2->print_fd = 0;
+      a2->dup_to = dup_to;
     }
   *gpg->argtail = a;
-  gpg->argtail = &a->next;
+  gpg->argtail = &a2->next;
   return 0;
 }