diff --git a/appveyor.yml b/appveyor.yml
index 1f3f30911..61f562dc7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,12 +1,14 @@
 version: 1.0.{build}
 configuration: Debug
 clone_depth: 50
+
 before_build:
 - echo %TIME%
 - git submodule update --init
 - echo %TIME%
-- cmake -G "Visual Studio 12" .
+- cmake -G "Visual Studio 12" -DSELF_TEST=1 -DBUILD_TOOLS=1 .
 - echo %TIME%
+
 build:
   project: Cuberite.sln
   parallel: true
diff --git a/tests/OSSupport/CMakeLists.txt b/tests/OSSupport/CMakeLists.txt
index 938538f14..60c68c472 100644
--- a/tests/OSSupport/CMakeLists.txt
+++ b/tests/OSSupport/CMakeLists.txt
@@ -23,6 +23,7 @@ if (WIN32)
 		${OSSupport_SRCS}
 		${OSSupport_HDRS}
 	)
+	target_link_libraries(OSSupport PUBLIC fmt::fmt)
 endif()
 
 # Define individual tests: