diff --git a/.appveyor.yml b/.appveyor.yml
index 00df2803..5de0caaa 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -7,9 +7,6 @@ os:
 environment:
   CTEST_OUPTUT_ON_FAILURE: ON
 
-configuration:
-  - Debug
-
 branches:
   except:
     - gh-pages
diff --git a/include/CLI/Validators.hpp b/include/CLI/Validators.hpp
index e32b7970..8cf567c1 100644
--- a/include/CLI/Validators.hpp
+++ b/include/CLI/Validators.hpp
@@ -27,7 +27,7 @@ namespace CLI {
 bool ExistingFile(std::string filename) {
     struct stat buffer;   
     bool exist = stat(filename.c_str(), &buffer) == 0; 
-    bool is_dir = (buffer.st_mode & S_IFDIR != 0);
+    bool is_dir = (buffer.st_mode & S_IFDIR) != 0;
     if(!exist) {
         std::cerr << "File does not exist: " << filename << std::endl;
         return false;