diff --git a/CMake/posixScandir.cxx b/CMake/posixScandir.cxx
index ea57e9ce2..8b91428b5 100644
--- a/CMake/posixScandir.cxx
+++ b/CMake/posixScandir.cxx
@@ -3,6 +3,7 @@
 
 int func (const char *d, dirent ***list, void *sort) {
   int n = scandir(d, list, 0, (int(*)(const dirent **, const dirent **))sort);
+  return n;
 }
 
 int main() {