diff --git a/src/mzscheme/include/scheme.h b/src/mzscheme/include/scheme.h
index 95d6f69873..f8e52208ac 100644
--- a/src/mzscheme/include/scheme.h
+++ b/src/mzscheme/include/scheme.h
@@ -166,7 +166,7 @@ typedef struct FSSpec mzFSSpec;
 
 #define MZ_EXTERN extern MZ_DLLSPEC
 
-#ifdef MZ_USE_PLACES
+#if defined(MZ_USE_PLACES) || defined(FUTURES_ENABLED)
 # if _MSC_VER
 #  define THREAD_LOCAL __declspec(thread)
 # else