diff --git a/engine/common/common.h b/engine/common/common.h
index ad168866..02c72621 100644
--- a/engine/common/common.h
+++ b/engine/common/common.h
@@ -492,7 +492,7 @@ void Image_AddCmdFlags( uint flags );
 void FS_FreeImage( rgbdata_t *pack );
 rgbdata_t *FS_LoadImage( const char *filename, const byte *buffer, size_t size ) MALLOC_LIKE( FS_FreeImage, 1 ) WARN_UNUSED_RESULT;
 qboolean FS_SaveImage( const char *filename, rgbdata_t *pix );
-rgbdata_t *FS_CopyImage( rgbdata_t *in ) MALLOC_LIKE( FS_FreeImage, 1 ) WARN_UNUSED_RESULT;
+rgbdata_t *FS_CopyImage( const rgbdata_t *in ) MALLOC_LIKE( FS_FreeImage, 1 ) WARN_UNUSED_RESULT;
 extern const bpc_desc_t PFDesc[];	// image get pixelformat
 qboolean Image_Process( rgbdata_t **pix, int width, int height, uint flags, float reserved );
 void Image_PaletteHueReplace( byte *palSrc, int newHue, int start, int end, int pal_size );
diff --git a/engine/common/imagelib/img_main.c b/engine/common/imagelib/img_main.c
index a7446cad..80e26fcc 100644
--- a/engine/common/imagelib/img_main.c
+++ b/engine/common/imagelib/img_main.c
@@ -597,14 +597,15 @@ FS_CopyImage
 make an image copy
 ================
 */
-rgbdata_t *FS_CopyImage( rgbdata_t *in )
+rgbdata_t *FS_CopyImage( const rgbdata_t *in )
 {
 	rgbdata_t	*out;
 	int	palSize = 0;
 
-	if( !in ) return NULL;
+	if( !in )
+		return NULL;
 
-	out = Mem_Malloc( host.imagepool, sizeof( rgbdata_t ));
+	out = Mem_Malloc( host.imagepool, sizeof( *out ));
 	*out = *in;
 
 	switch( in->type )
diff --git a/engine/ref_api.h b/engine/ref_api.h
index ed119f69..e71543e0 100644
--- a/engine/ref_api.h
+++ b/engine/ref_api.h
@@ -467,7 +467,7 @@ typedef struct ref_api_s
 	qboolean (*Image_Process)( rgbdata_t **pix, int width, int height, uint flags, float reserved );
 	rgbdata_t *(*FS_LoadImage)( const char *filename, const byte *buffer, size_t size );
 	qboolean (*FS_SaveImage)( const char *filename, rgbdata_t *pix );
-	rgbdata_t *(*FS_CopyImage)( rgbdata_t *in );
+	rgbdata_t *(*FS_CopyImage)( const rgbdata_t *in );
 	void (*FS_FreeImage)( rgbdata_t *pack );
 	void (*Image_SetMDLPointer)( byte *p );
 	const struct bpc_desc_s *(*Image_GetPFDesc)( int idx );