diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index 6de6d1ef4b9db..3f8ff6274ec37 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -2250,6 +2250,12 @@ extern "C" {
     pub fn freeifaddrs(ifa: *mut ::ifaddrs);
 
     pub fn stack_getbounds(sp: *mut ::stack_t) -> ::c_int;
+    pub fn getgrouplist(
+        name: *const ::c_char,
+        basegid: ::gid_t,
+        groups: *mut ::gid_t,
+        ngroups: *mut ::c_int,
+    ) -> ::c_int;
     pub fn initgroups(name: *const ::c_char, basegid: ::gid_t) -> ::c_int;
     pub fn setgroups(ngroups: ::c_int, ptr: *const ::gid_t) -> ::c_int;
     pub fn ioctl(fildes: ::c_int, request: ::c_int, ...) -> ::c_int;