diff --git a/std/file.d b/std/file.d
index 9f26ebb53..6bcb231d7 100644
--- a/std/file.d
+++ b/std/file.d
@@ -1846,7 +1846,7 @@ else version (Posix)
         stat_t statbuf;
         // check that both lvalues and rvalues work
         timeLastAccessed(statbuf);
-        timeLastAccessed(stat_t.init);
+        cast(void) timeLastAccessed(stat_t.init);
     }
 }
 
diff --git a/std/typecons.d b/std/typecons.d
index 5af60e3a3..b49b989ef 100644
--- a/std/typecons.d
+++ b/std/typecons.d
@@ -8251,7 +8251,7 @@ if (alignment > 0 && !((alignment - 1) & alignment))
         void test(size_t size)
         {
             import core.stdc.stdlib;
-            alloca(size);
+            cast(void) alloca(size);
             alignmentTest();
         }
         foreach (i; 0 .. 10)