--- a/src/runtime/x86-64-darwin-os.h
+++ b/src/runtime/x86-64-darwin-os.h
@@ -16,4 +16,7 @@
 #define CONTEXT_ADDR_FROM_STEM(stem) &context->uc_mcontext->ss.stem
 #endif /* __DARWIN_UNIX03 */
 
+#define RESTORE_FP_CONTROL_FROM_CONTEXT
+void os_restore_fp_control(os_context_t *context);
+
 #endif /* _X86_64_DARWIN_OS_H */