diff --git a/cores/libretro-imageviewer/image_core.c b/cores/libretro-imageviewer/image_core.c
index 831c120af0..7109b3c5ca 100644
--- a/cores/libretro-imageviewer/image_core.c
+++ b/cores/libretro-imageviewer/image_core.c
@@ -72,7 +72,7 @@ static struct string_list *image_file_list;
 static const char* IMAGE_CORE_PREFIX(valid_extensions) = "jpg|jpeg|png|bmp|psd|tga|gif|hdr|pic|ppm|pgm";
 #else
 
-static const char* IMAGE_CORE_PREFIX(valid_extensions) = 1+ /* to remove the first |, the alternative is 25 extra lines of ifdef/etc */
+static const char image_formats[] =
 
 #ifdef HAVE_RJPEG
 "|jpg|jpeg"
@@ -95,6 +95,9 @@ static const char* IMAGE_CORE_PREFIX(valid_extensions) = 1+ /* to remove the fir
 #endif
 ;
 
+/* to remove the first |, the alternative is 25 extra lines of ifdef/etc */
+static const char* IMAGE_CORE_PREFIX(valid_extensions) = image_formats + 1;
+
 #endif
 
 void IMAGE_CORE_PREFIX(retro_get_system_info)(struct retro_system_info *info)