diff --git a/cores/libretro-imageviewer/image_core.c b/cores/libretro-imageviewer/image_core.c
index 9ad38033b3..f8e5d96902 100644
--- a/cores/libretro-imageviewer/image_core.c
+++ b/cores/libretro-imageviewer/image_core.c
@@ -71,46 +71,30 @@ static const char* IMAGE_CORE_PREFIX(valid_extensions) = "jpg|jpeg|png|bmp|psd|t
 #else
 
 #ifdef HAVE_RJPEG
-#define RJPEG_ARGS "jpg|jpeg"
-
-#ifdef HAVE_RPNG
-#define RJPEG_SEP "|"
-#endif
-
+#define RJPEG_ARGS "|jpg|jpeg"
 #else
 #define RJPEG_ARGS
-#define RJPEG_SEP
 #endif
 
 #ifdef HAVE_RPNG
-#define RPNG_ARGS "png"
-
-#ifdef HAVE_RBMP
-#define RPNG_SEP "|"
-#endif
+#define RPNG_ARGS "|png"
 #else
 #define RPNG_ARGS
-#define RPNG_SEP
 #endif
 
 #ifdef HAVE_RBMP
-#define RBMP_ARGS "bmp"
-
-#ifdef HAVE_RTGA
-#define RBMP_SEP "|"
-#endif
+#define RBMP_ARGS "|bmp"
 #else
 #define RBMP_ARGS
-#define RBMP_SEP
 #endif
 
 #ifdef HAVE_RTGA
-#define RTGA_ARGS "tga"
+#define RTGA_ARGS "|tga"
 #else
 #define RTGA_ARGS
 #endif
 
-static const char* IMAGE_CORE_PREFIX(valid_extensions) = RJPEG_ARGS RJPEG_SEP RPNG_ARGS RPNG_SEP RBMP_ARGS RBMP_SEP RTGA_ARGS;
+static const char* IMAGE_CORE_PREFIX(valid_extensions) = RJPEG_ARGS RPNG_ARGS RBMP_ARGS RTGA_ARGS + 1; /* +1 to remove the extra | */
 #endif
 
 void IMAGE_CORE_PREFIX(retro_get_system_info)(struct retro_system_info *info)