diff --git a/src/main/java/org/cryptomator/frontend/fuse/ReadWriteAdapter.java b/src/main/java/org/cryptomator/frontend/fuse/ReadWriteAdapter.java
index e8a8355..810c312 100644
--- a/src/main/java/org/cryptomator/frontend/fuse/ReadWriteAdapter.java
+++ b/src/main/java/org/cryptomator/frontend/fuse/ReadWriteAdapter.java
@@ -160,7 +160,9 @@ public int chmod(String path, int mode, FileInfo fi) {
 			LOG.warn("chmod {} failed, file not found.", path);
 			return -errno.enoent();
 		} catch (UnsupportedOperationException e) {
-			LOG.warn("Setting posix permissions not supported by underlying file system.");
+			if (!WindowsUtil.IS_RUNNING_OS) { //prevent spamming warnings
+				LOG.warn("Setting posix permissions not supported by underlying file system.");
+			}
 			return -errno.enosys();
 		} catch (IOException | RuntimeException e) {
 			LOG.error("chmod {} failed.", path, e);
diff --git a/src/main/java/org/cryptomator/frontend/fuse/WindowsUtil.java b/src/main/java/org/cryptomator/frontend/fuse/WindowsUtil.java
new file mode 100644
index 0000000..d5705a1
--- /dev/null
+++ b/src/main/java/org/cryptomator/frontend/fuse/WindowsUtil.java
@@ -0,0 +1,10 @@
+package org.cryptomator.frontend.fuse;
+
+public class WindowsUtil {
+
+	public static final boolean IS_RUNNING_OS = System.getProperty("os.name").toLowerCase().contains("windows");
+
+	private WindowsUtil() {}
+
+
+}