diff --git a/common/rdr/InStream.h b/common/rdr/InStream.h
index 760fb3d..212a2ec 100644
--- a/common/rdr/InStream.h
+++ b/common/rdr/InStream.h
@@ -92,7 +92,7 @@
 
     // readBytes() reads an exact number of bytes.
 
-    virtual void readBytes(void* data, int length) {
+    void readBytes(void* data, int length) {
       U8* dataPtr = (U8*)data;
       U8* dataEnd = dataPtr + length;
       while (dataPtr < dataEnd) {
diff --git a/common/rdr/OutStream.h b/common/rdr/OutStream.h
index 4afd4bf..94d57dd 100644
--- a/common/rdr/OutStream.h
+++ b/common/rdr/OutStream.h
@@ -89,7 +89,7 @@
 
     // writeBytes() writes an exact number of bytes.
 
-    virtual void writeBytes(const void* data, int length) {
+    void writeBytes(const void* data, int length) {
       const U8* dataPtr = (const U8*)data;
       const U8* dataEnd = dataPtr + length;
       while (dataPtr < dataEnd) {