diff --git a/include/site/linux-uclibc b/include/site/linux-uclibc
index 3b6c422b47..90f1f4a772 100644
--- a/include/site/linux-uclibc
+++ b/include/site/linux-uclibc
@@ -22,6 +22,7 @@ ac_cv_func_malloc_0_nonnull=yes
 ac_cv_func_malloc_works=yes
 ac_cv_func_memcmp_clean=yes
 ac_cv_func_memcmp_working=yes
+ac_cv_func_posix_getgrgid_r=yes
 ac_cv_func_posix_getpwuid_r=yes
 ac_cv_func_pthread_key_delete=yes
 ac_cv_func_realloc_0_nonnull=yes