diff --git a/include/site/linux-gnu b/include/site/linux-gnu
index 5640e2a7f8..ca4fd29c9b 100644
--- a/include/site/linux-gnu
+++ b/include/site/linux-gnu
@@ -31,6 +31,7 @@ ac_cv_func_realloc_works=yes
 ac_cv_func_rename=yes
 ac_cv_func_rindex=yes
 ac_cv_func_setlocale=yes
+ac_cv_func_setgrent_void=yes
 ac_cv_func_setpgrp_void=yes
 ac_cv_func_setresuid=no
 ac_cv_func_setvbuf_reversed=no
diff --git a/include/site/linux-uclibc b/include/site/linux-uclibc
index 5640e2a7f8..ca4fd29c9b 100644
--- a/include/site/linux-uclibc
+++ b/include/site/linux-uclibc
@@ -31,6 +31,7 @@ ac_cv_func_realloc_works=yes
 ac_cv_func_rename=yes
 ac_cv_func_rindex=yes
 ac_cv_func_setlocale=yes
+ac_cv_func_setgrent_void=yes
 ac_cv_func_setpgrp_void=yes
 ac_cv_func_setresuid=no
 ac_cv_func_setvbuf_reversed=no