diff --git a/tccgen.c b/tccgen.c
index dc67f028..3cf37155 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -2258,6 +2258,8 @@ static void gen_assign_cast(CType *dt)
     st = &vtop->type; /* source type */
     dbt = dt->t & VT_BTYPE;
     sbt = st->t & VT_BTYPE;
+    if (sbt == VT_VOID)
+        tcc_error("Cannot assign void value");
     if (dt->t & VT_CONSTANT)
         tcc_warning("assignment of read-only location");
     switch(dbt) {