diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..393d4c4
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,42 @@
+name: Test Suite
+
+# Only triggers on pushes/PRs to master
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+
+jobs:
+    test:
+        name: CI
+        strategy:
+            matrix:
+                os: [ubuntu-latest, windows-latest, macOS-latest]
+                dc: [dmd-latest, ldc-latest]
+                arch: [x86_64]
+                config: [select, epoll, cfrunloop, winapi]
+                exclude:
+                  - {os: ubuntu-latest, config: cfrunloop}
+                  - {os: ubuntu-latest, config: winapi}
+                  - {os: macOS-latest, config: epoll}
+                  - {os: macOS-latest, config: winapi}
+                  - {os: windows-latest, config: cfrunloop}
+                  - {os: windows-latest, config: epoll}
+
+        runs-on: ${{ matrix.os }}
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Install D compiler
+              uses: dlang-community/setup-dlang@v1
+              with:
+                  compiler: ${{ matrix.dc }}
+
+            - name: Run tests
+              env:
+                CONFIG: ${{matrix.config}}
+              shell: bash
+              run: ./travis-ci.sh
diff --git a/source/eventcore/drivers/threadedfile.d b/source/eventcore/drivers/threadedfile.d
index c3b9dd4..9058483 100644
--- a/source/eventcore/drivers/threadedfile.d
+++ b/source/eventcore/drivers/threadedfile.d
@@ -25,7 +25,7 @@ version (Windows) {
 			int close(int fd) @safe;
 			int read(int fd, void *buffer, uint count);
 			int write(int fd, in void *buffer, uint count);
-			off_t lseek(int fd, off_t offset, int whence) @safe;
+			long _lseeki64(int fd, long offset, int origin) @safe;
 		}
 
 		enum O_RDONLY = 0;
@@ -46,6 +46,11 @@ else
 	enum O_BINARY = 0;
 }
 
+version (darwin) {
+	// NOTE: Always building for 64-bit, so these are identical
+	alias lseek64 = lseek;
+}
+
 private {
 	enum SEEK_SET = 0;
 	enum SEEK_CUR = 1;
@@ -197,7 +202,9 @@ final class ThreadedFileEventDriver(Events : EventDriverEvents) : EventDriverFil
 
 		version (linux) {
 			// stat_t seems to be defined wrong on linux/64
-			return .lseek(cast(int)file, 0, SEEK_END);
+			return .lseek64(cast(int)file, 0, SEEK_END);
+		} else version (Windows) {
+			return _lseeki64(cast(int)file, 0, SEEK_END);
 		} else {
 			stat_t st;
 			() @trusted { fstat(cast(int)file, &st); } ();
@@ -361,9 +368,8 @@ log("start processing");
 
 		auto bytes = buffer;
 		version (Windows) {
-			assert(offset <= off_t.max);
-			.lseek(cast(int)file, cast(off_t)offset, SEEK_SET);
-		} else .lseek(cast(int)file, offset, SEEK_SET);
+			._lseeki64(cast(int)file, offset, SEEK_SET);
+		} else .lseek64(cast(int)file, offset, SEEK_SET);
 
 		scope (exit) {
 log("trigger event");
diff --git a/travis-ci.sh b/travis-ci.sh
index 2fb75ba..83bbb4a 100755
--- a/travis-ci.sh
+++ b/travis-ci.sh
@@ -6,8 +6,8 @@ set -e -x -o pipefail
 dub build -b release --compiler=$DC -c $CONFIG
 
 # test for successful 32-bit build
-if [ "$DC" == "dmd" ]; then
-	dub build --arch=x86 -c $CONFIG
+if [ "$DC" == "ldc2" ]; then
+	dub build --arch=x86 --compiler=ldc2 -c $CONFIG
 fi
 
 dub test --compiler=$DC -c $CONFIG
@@ -18,7 +18,8 @@ if [ ${BUILD_EXAMPLE=1} -eq 1 ]; then
         dub build --compiler=$DC --override-config eventcore/$CONFIG --single $ex
     done
     rm -rf examples/.dub/
-    rm examples/*-example
+    rm -f examples/*-example
+    rm -f examples/*-example.exe
 fi
 if [ ${RUN_TEST=1} -eq 1 ]; then
     for ex in `\ls -1 tests/*.d`; do