diff --git a/LibCore/CIODevice.cpp b/LibCore/CIODevice.cpp
index 80ac9ef18e..a85efc6b73 100644
--- a/LibCore/CIODevice.cpp
+++ b/LibCore/CIODevice.cpp
@@ -173,3 +173,14 @@ bool CIODevice::close()
     set_mode(CIODevice::NotOpen);
     return true;
 }
+
+bool CIODevice::seek(signed_qword offset)
+{
+    int rc = lseek(m_fd, offset, SEEK_SET);
+    if (rc < 0) {
+        perror("CIODevice::seek: lseek");
+        return false;
+    }
+    m_buffered_data.clear();
+    return true;
+}
diff --git a/LibCore/CIODevice.h b/LibCore/CIODevice.h
index 931fcb2ce5..7a8b354b2e 100644
--- a/LibCore/CIODevice.h
+++ b/LibCore/CIODevice.h
@@ -35,6 +35,8 @@ public:
 
     bool can_read() const;
 
+    bool seek(signed_qword);
+
     virtual bool open(CIODevice::OpenMode) = 0;
     virtual bool close();