diff --git a/src/unix/bsd/openbsdlike/openbsd.rs b/src/unix/bsd/openbsdlike/openbsd.rs
index 76f946d9af579..dea5e8e49a8eb 100644
--- a/src/unix/bsd/openbsdlike/openbsd.rs
+++ b/src/unix/bsd/openbsdlike/openbsd.rs
@@ -211,6 +211,9 @@ pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 2;
 pub const HW_AVAILCPU: ::c_int = 25;
 pub const KERN_PROC_ARGS: ::c_int = 55;
 
+// syscall numbers
+pub const NR_GETENTROPY: ::c_int = 7;
+
 extern {
     pub fn mprotect(addr: *const ::c_void, len: ::size_t, prot: ::c_int)
                     -> ::c_int;