diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index eef14b4..8042c11 100644
--- a/spec/build_tests_spec.rb
+++ b/spec/build_tests_spec.rb
@@ -470,7 +470,7 @@ EOF
         "gdc -c -o main.o main.d",
         "gdc -o hello-d.exe main.o",
       ]
-      expect(`./hello-d`.rstrip).to eq "Hello from D!"
+      expect(`./hello-d.exe`.rstrip).to eq "Hello from D!"
     end
   end