diff --git a/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java b/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java
index 8a189d64f..811b7df1b 100644
--- a/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java
+++ b/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystem.java
@@ -224,11 +224,11 @@ public class FileSystem {
     public synchronized void copy(String sourcePath, String destPath) throws FileSystemException {
         sourcePath = sanitizePath(sourcePath);
         destPath = sanitizePath(destPath);
-        if (isReadOnly(destPath)) throw new FileSystemException("/" + destPath + ": " + ACCESS_DENIED);
-        if (!exists(sourcePath)) throw new FileSystemException("/" + sourcePath + ": " + NO_SUCH_FILE);
-        if (exists(destPath)) throw new FileSystemException("/" + destPath + ": " + FILE_EXISTS);
+        if (isReadOnly(destPath)) throw new FileSystemException(destPath, ACCESS_DENIED);
+        if (!exists(sourcePath)) throw new FileSystemException(sourcePath, NO_SUCH_FILE);
+        if (exists(destPath)) throw new FileSystemException(destPath, FILE_EXISTS);
         if (contains(sourcePath, destPath)) {
-            throw new FileSystemException("/" + sourcePath + ": Can't copy a directory inside itself");
+            throw new FileSystemException(sourcePath, "Can't copy a directory inside itself");
         }
         copyRecursive(sourcePath, getMount(sourcePath), destPath, getMount(destPath), 0);
     }
@@ -341,7 +341,7 @@ public class FileSystem {
             }
         }
         if (match == null) {
-            throw new FileSystemException("/" + path + ": Invalid Path");
+            throw new FileSystemException(path, "Invalid Path");
         }
         return match;
     }
diff --git a/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystemException.java b/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystemException.java
index a1dd0c416..38760f806 100644
--- a/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystemException.java
+++ b/projects/core/src/main/java/dan200/computercraft/core/filesystem/FileSystemException.java
@@ -13,8 +13,12 @@ public class FileSystemException extends Exception {
     @Serial
     private static final long serialVersionUID = -2500631644868104029L;
 
-    FileSystemException(String s) {
-        super(s);
+    FileSystemException(String message) {
+        super(message);
+    }
+
+    FileSystemException(String path, String message) {
+        this("/" + path + ": " + message);
     }
 
     public static FileSystemException of(IOException e) {
diff --git a/projects/core/src/main/java/dan200/computercraft/core/filesystem/MountWrapper.java b/projects/core/src/main/java/dan200/computercraft/core/filesystem/MountWrapper.java
index 3a98d62b6..10d9243e2 100644
--- a/projects/core/src/main/java/dan200/computercraft/core/filesystem/MountWrapper.java
+++ b/projects/core/src/main/java/dan200/computercraft/core/filesystem/MountWrapper.java
@@ -129,7 +129,7 @@ class MountWrapper {
     }
 
     public void makeDirectory(String path) throws FileSystemException {
-        if (writableMount == null) throw exceptionOf(path, ACCESS_DENIED);
+        if (writableMount == null) throw new FileSystemException(path, ACCESS_DENIED);
 
         path = toLocal(path);
         try {
@@ -140,7 +140,7 @@ class MountWrapper {
     }
 
     public void delete(String path) throws FileSystemException {
-        if (writableMount == null) throw exceptionOf(path, ACCESS_DENIED);
+        if (writableMount == null) throw new FileSystemException(path, ACCESS_DENIED);
 
         path = toLocal(path);
         try {
@@ -151,7 +151,7 @@ class MountWrapper {
     }
 
     public void rename(String source, String dest) throws FileSystemException {
-        if (writableMount == null) throw exceptionOf(source, ACCESS_DENIED);
+        if (writableMount == null) throw new FileSystemException(source, ACCESS_DENIED);
 
         source = toLocal(source);
         dest = toLocal(dest);
@@ -168,7 +168,7 @@ class MountWrapper {
     }
 
     public SeekableByteChannel openForWrite(String path, Set<OpenOption> options) throws FileSystemException {
-        if (writableMount == null) throw exceptionOf(path, ACCESS_DENIED);
+        if (writableMount == null) throw new FileSystemException(path, ACCESS_DENIED);
 
         path = toLocal(path);
         try {
@@ -206,10 +206,6 @@ class MountWrapper {
 
     private FileSystemException localExceptionOf(String path, String message) {
         if (!location.isEmpty()) path = path.isEmpty() ? location : location + "/" + path;
-        return exceptionOf(path, message);
-    }
-
-    private static FileSystemException exceptionOf(String path, String message) {
-        return new FileSystemException("/" + path + ": " + message);
+        return new FileSystemException(path, message);
     }
 }