diff --git a/src/s/aix3-2.h b/src/s/aix3-2.h
index 45c64a17012..eb0fa5ddc85 100644
--- a/src/s/aix3-2.h
+++ b/src/s/aix3-2.h
@@ -2,6 +2,8 @@
 
 #include "aix3-1.h"
 
+#define AIX3_2
+
 /* No need to define this--the header files indicate X11R4,
    and that's supposedly what 3.2 will come with.  */
 #undef SPECIFY_X11R4