diff --git a/bsd/sys/cddl/compat/opensolaris/sys/proc.h b/bsd/sys/cddl/compat/opensolaris/sys/proc.h
index d33065aa52923162507ea677876d35c730b7372a..8b69938a0fff8868a60f60d4d143cdad38a7eff1 100644
--- a/bsd/sys/cddl/compat/opensolaris/sys/proc.h
+++ b/bsd/sys/cddl/compat/opensolaris/sys/proc.h
@@ -34,7 +34,7 @@
 #include <stdint.h>
 #include <sys/lock.h>
 #include <sys/mutex.h>
-#include <sys/unistd.h>
+#include <unistd.h>
 #include <sys/debug.h>
 #include <sys/kthread.h>