diff --git a/appveyor.yml b/appveyor.yml
index 379b32f..9117e57 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -23,6 +23,10 @@ build_script:
   - cl ccronexpr.c ccronexpr_test.c /W4 /D_CRT_SECURE_NO_WARNINGS /Feccronexpr_32.exe
   - call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
   - cl ccronexpr.c ccronexpr_test.c /W4 /D_CRT_SECURE_NO_WARNINGS /Feccronexpr_64.exe
+  - call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars32.bat"
+  - cl ccronexpr.c supertinycron.c /W4 /D_CRT_SECURE_NO_WARNINGS /Fesupertinycron_32.exe
+  - call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
+  - cl ccronexpr.c supertinycron.c /W4 /D_CRT_SECURE_NO_WARNINGS /Fesupertinycron_64.exe
 
 test_script:
   - ccronexpr_32.exe