diff --git a/src/cmd/compile/internal/gc/align.go b/src/cmd/compile/internal/gc/align.go
index 741c5dd76c424..0fc3c2b97c3bf 100644
--- a/src/cmd/compile/internal/gc/align.go
+++ b/src/cmd/compile/internal/gc/align.go
@@ -119,6 +119,10 @@ func dowidth(t *Type) {
 	}
 
 	if t.Width > 0 {
+		if t.Align == 0 {
+			// See issue 11354
+			Fatal("zero alignment with nonzero size %v", t)
+		}
 		return
 	}