diff --git a/logging.c b/logging.c
index 398b7e053..c04f160c2 100644
--- a/logging.c
+++ b/logging.c
@@ -18,6 +18,10 @@
  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  */
 
+#ifdef __TANDEM
+# include <floss.h>
+#endif
+
 #include "config.h"
 
 #include <sys/types.h>