diff --git a/basement.cabal b/basement.cabal
index f85f617..1484ad7 100644
--- a/basement.cabal
+++ b/basement.cabal
@@ -156,4 +156,5 @@ library
   else
     cpp-options: -DARCH_IS_UNKNOWN_ENDIAN
   include-dirs:      cbits
-  c-sources:         cbits/foundation_mem.c
+  if !os(ghcjs)
+    c-sources:       cbits/foundation_mem.c