diff --git a/cores/internal_cores.h b/cores/internal_cores.h
index 4ec315b70d..60fbb49417 100644
--- a/cores/internal_cores.h
+++ b/cores/internal_cores.h
@@ -128,6 +128,7 @@ size_t libretro_ffmpeg_retro_get_memory_size(unsigned id);
 
 #endif
 
+#ifdef HAVE_IMAGEVIEWER
 /* Internal image viewer core. */
 
 void libretro_imageviewer_retro_init(void);
@@ -182,3 +183,5 @@ void *libretro_imageviewer_retro_get_memory_data(unsigned id);
 size_t libretro_imageviewer_retro_get_memory_size(unsigned id);
 
 #endif
+
+#endif