diff --git a/src/include/port/aix.h b/src/include/port/aix.h
index 1d50688d90f4c13c5a70776cb0cac5411b9b344e..30b9a18493b71cdcb1464a0d5b74aa5be6d4c7dc 100644
--- a/src/include/port/aix.h
+++ b/src/include/port/aix.h
@@ -1,3 +1,5 @@
+#  define USE_POSIX_TIME 
+#  define USE_POSIX_SIGNALS
 #  define CLASS_CONFLICT 
 #  define DISABLE_XOPEN_NLS 
 #  define HAVE_ANSI_CPP