diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 738887d5c1f..8a18843758c 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -230,6 +230,11 @@ millitimer()
 
 #ifdef BSD_TIME
 
+#ifdef _IBMR2
+/* AIX defines fd_set in a separate file.  Sigh... */
+#include <sys/select.h>
+#endif
+
 long
 millitimer()
 {