diff --git a/.appveyor.yml b/.appveyor.yml
new file mode 100644
index 00000000..b15c0f9e
--- /dev/null
+++ b/.appveyor.yml
@@ -0,0 +1,10 @@
+configuration: Release
+
+image:
+  - Visual Studio 2019
+  - Ubuntu
+  - macOS
+
+build_script:
+  - cmake .
+  - cmake --build . --config %CONFIGURATION%
\ No newline at end of file
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 064386a9..079a1a45 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,8 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest]
-        # os: [windows-latest, ubuntu-latest, macOS-latest]
+        os: [windows-latest, ubuntu-latest, macOS-latest]
 
     steps:
     - uses: actions/checkout@v1
diff --git a/ports/bsd/mstimer-init.c b/ports/bsd/mstimer-init.c
index 93bbffc4..32559fc9 100644
--- a/ports/bsd/mstimer-init.c
+++ b/ports/bsd/mstimer-init.c
@@ -22,11 +22,12 @@
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *********************************************************************/
+#include <limits.h>
 #include <stdio.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <time.h>
-#include "mstimer.h"
+#include "bacnet/basic/sys/mstimer.h"
 #include <mach/clock.h>
 #include <mach/mach.h>