diff --git a/lib/wasi/Cargo.toml b/lib/wasi/Cargo.toml
index efd64270e..34c65ff4c 100644
--- a/lib/wasi/Cargo.toml
+++ b/lib/wasi/Cargo.toml
@@ -19,6 +19,7 @@ log = "0.4.6"
 byteorder = "1.3.1"
 # hack to get tests to work
 wasmer-singlepass-backend = { path = "../singlepass-backend", version = "0.4.2", optional = true }
+winapi = { version = "0.3.7", optional = true }
 
 [build-dependencies]
 glob = "0.2.11"
diff --git a/lib/wasi/src/syscalls/windows.rs b/lib/wasi/src/syscalls/windows.rs
index 6273695d3..e86caa2e8 100644
--- a/lib/wasi/src/syscalls/windows.rs
+++ b/lib/wasi/src/syscalls/windows.rs
@@ -5,7 +5,21 @@ pub fn platform_clock_res_get(
     clock_id: __wasi_clockid_t,
     resolution: &Cell<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    __WASI_EINVAL
+    let resolution = match clock_id {
+        // resolution of monotonic clock at 10ms, from:
+        // https://docs.microsoft.com/en-us/windows/desktop/api/sysinfoapi/nf-sysinfoapi-gettickcount64
+        __WASI_CLOCK_MONOTONIC => 10_000_000,
+        // TODO: verify or compute this
+        __WASI_CLOCK_REALTIME => 1,
+        __WASI_CLOCK_PROCESS_CPUTIME_ID => {
+            return __WASI_EINVAL;
+        }
+        __WASI_CLOCK_THREAD_CPUTIME_ID => {
+            return __WASI_EINVAL;
+        }
+    };
+    resolution.set(resolution);
+    __WASI_ESUCCESS
 }
 
 pub fn platform_clock_time_get(
@@ -13,5 +27,24 @@ pub fn platform_clock_time_get(
     precision: __wasi_timestamp_t,
     time: &Cell<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    unimplemented!()
+    let nanos = match clock_id {
+        __WASI_CLOCK_MONOTONIC => {
+            let tick_ms = winapi::um::sysinfoapi::GetTickCount64();
+            tick_ms * 1_000_000
+        }
+        __WASI_CLOCK_REALTIME => {
+            let duration = wasi_try!(std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .ok_or(__WASI_EIO));
+            duration.as_nanos() as u64
+        }
+        __WASI_CLOCK_PROCESS_CPUTIME_ID => {
+            unimplemented!("wasi::platform_clock_time_get(__WASI_CLOCK_PROCESS_CPUTIME_ID, ..)")
+        }
+        __WASI_CLOCK_THREAD_CPUTIME_ID => {
+            unimplemented!("wasi::platform_clock_time_get(__WASI_CLOCK_THREAD_CPUTIME_ID, ..)")
+        }
+    };
+    time.set(nanos);
+    __WASI_ESUCCESS
 }