diff --git a/cddl/lib/libdtrace/libproc_compat.h b/cddl/lib/libdtrace/libproc_compat.h
index a561157c0ba2..d796f34f48aa 100644
--- a/cddl/lib/libdtrace/libproc_compat.h
+++ b/cddl/lib/libdtrace/libproc_compat.h
@@ -54,7 +54,6 @@
 #define	Psetbkpt proc_bkptset
 #define	Psetflags proc_setflags
 #define	Pstate proc_state
-#define	Pstate proc_state
 #define	Psymbol_iter_by_addr proc_iter_symbyaddr
 #define	Punsetflags proc_clearflags
 #define	Pupdate_maps(p) do { } while (0)