diff --git a/Cargo.lock b/Cargo.lock
index d23ccdd223c..f5504e8c14d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2492,6 +2492,7 @@ dependencies = [
  "wasmer-dev-utils 0.4.2",
  "wasmer-runtime-core 0.4.2",
  "wasmer-singlepass-backend 0.4.2",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/lib/wasi/Cargo.toml b/lib/wasi/Cargo.toml
index efd64270e99..e59b45f96b2 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 = "0.3"
 
 [build-dependencies]
 glob = "0.2.11"
diff --git a/lib/wasi/src/lib.rs b/lib/wasi/src/lib.rs
index 8621dc55e8b..2ebf294b31e 100644
--- a/lib/wasi/src/lib.rs
+++ b/lib/wasi/src/lib.rs
@@ -2,6 +2,8 @@
 
 #[macro_use]
 extern crate log;
+#[cfg(target = "windows")]
+extern crate winapi;
 
 #[macro_use]
 mod macros;
diff --git a/lib/wasi/src/syscalls/windows.rs b/lib/wasi/src/syscalls/windows.rs
index 6273695d322..f6559290bbc 100644
--- a/lib/wasi/src/syscalls/windows.rs
+++ b/lib/wasi/src/syscalls/windows.rs
@@ -5,7 +5,22 @@ pub fn platform_clock_res_get(
     clock_id: __wasi_clockid_t,
     resolution: &Cell<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    __WASI_EINVAL
+    let resolution_val = 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;
+        }
+        _ => return __WASI_EINVAL,
+    };
+    resolution.set(resolution_val);
+    __WASI_ESUCCESS
 }
 
 pub fn platform_clock_time_get(
@@ -13,5 +28,28 @@ 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 = unsafe { 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)
+                .map_err(|e| {
+                    debug!("Error in wasi::platform_clock_time_get: {:?}", e);
+                    __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, ..)")
+        }
+        _ => return __WASI_EINVAL,
+    };
+    time.set(nanos);
+    __WASI_ESUCCESS
 }