diff --git a/tccgen.c b/tccgen.c
index 0937883a..9076da51 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -2441,6 +2441,8 @@ static void gen_assign_cast(CType *dt)
         if (sbt == VT_PTR || sbt == VT_FUNC) {
             tcc_warning("assignment makes integer from pointer without a cast");
         }
+        if (sbt == VT_STRUCT)
+            goto error;
         /* XXX: more tests */
         break;
     case VT_STRUCT: