diff --git a/dmd/mtype.c b/dmd/mtype.c
index d3ac1bc2..bb5d9e0e 100644
--- a/dmd/mtype.c
+++ b/dmd/mtype.c
@@ -1002,6 +1002,8 @@ d_uns64 TypeBasic::size(Loc loc)
 
 unsigned TypeBasic::alignsize()
 {
+    if (ty == Tvoid)
+        return 1;
     return getABITypeAlign(DtoType(this));
 }