diff --git a/js/src/vm/ForkJoin.cpp b/js/src/vm/ForkJoin.cpp
index 5a55c9e89233..76acb5ff78b9 100644
--- a/js/src/vm/ForkJoin.cpp
+++ b/js/src/vm/ForkJoin.cpp
@@ -25,12 +25,15 @@
 # include "vm/Monitor.h"
 #endif
 
-#if defined(DEBUG) && defined(JS_THREADSAFE) && defined(JS_ION)
-# include "jit/Ion.h"
-# include "jit/JitCompartment.h"
-# include "jit/MIR.h"
-# include "jit/MIRGraph.h"
-#endif // DEBUG && THREADSAFE && ION
+#if defined(JS_THREADSAFE) && defined(JS_ION)
+# include "jit/JitCommon.h"
+# ifdef DEBUG
+#  include "jit/Ion.h"
+#  include "jit/JitCompartment.h"
+#  include "jit/MIR.h"
+#  include "jit/MIRGraph.h"
+# endif
+#endif // THREADSAFE && ION
 
 #include "vm/Interpreter-inl.h"