diff --git a/std/container/array.d b/std/container/array.d
index 93e861b7e95..b8aadf3c69c 100644
--- a/std/container/array.d
+++ b/std/container/array.d
@@ -1930,11 +1930,11 @@ if (is(Unqual!T == bool))
             // Fits within the current array
             if (stuff)
             {
-                data[$ - 1] |= (1u << rem);
+                data[$ - 1] |= (cast(size_t)1 << rem);
             }
             else
             {
-                data[$ - 1] &= ~(1u << rem);
+                data[$ - 1] &= ~(cast(size_t)1 << rem);
             }
         }
         else
@@ -1961,6 +1961,15 @@ if (is(Unqual!T == bool))
     /// ditto
     alias stableInsertBack = insertBack;
 
+    unittest
+    {
+        Array!bool a;
+        for (int i = 0; i < 100; ++i)
+            a.insertBack(true);
+        foreach (e; a)
+            assert(e);
+    }
+
     /**
        Removes the value at the front or back of the container. The
        stable version behaves the same, but guarantees that ranges