diff --git a/appveyor.yml b/appveyor.yml
index 3ccc21b..304c460 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -66,4 +66,6 @@ build: off
 
 test_script:
   - PATH=%ADDPATH%%PATH%
-  - b2 libs/system/test toolset=%TOOLSET% %CXXFLAGS%
+  - PATH
+  - ECHO b2 libs/system/test toolset=%TOOLSET% %CXXFLAGS%
+  - b2 --debug-configuration libs/system/test toolset=%TOOLSET% %CXXFLAGS%