diff --git a/src/imageio/imageio.c b/src/imageio/imageio.c
index de379ab22aaf..a3390c0ff183 100644
--- a/src/imageio/imageio.c
+++ b/src/imageio/imageio.c
@@ -300,7 +300,7 @@ static const dt_magic_bytes_t _magic_signatures[] = {
   { DT_FILETYPE_RW2, TRUE, 0, 8, dt_imageio_open_rawspeed,
     { 'I', 'I', 'U', 0x00, 0x08, 0x00, 0x00, 0x00 } },
   // Sigma Foveon X3F file
-  { DT_FILETYPE_X3F, TRUE, 0, 4, NULL,
+  { DT_FILETYPE_X3F, TRUE, 0, 4, dt_imageio_open_libraw,
     { 'F', 'O', 'V', 'b' } },
   // Nikon NEF files are TIFFs with (usually) the string "NIKON CORP" early in the file
   { DT_FILETYPE_NEF, FALSE, 0, 4, dt_imageio_open_rawspeed,
diff --git a/src/imageio/imageio_libraw.c b/src/imageio/imageio_libraw.c
index e091be965046..84c2b59faea3 100644
--- a/src/imageio/imageio_libraw.c
+++ b/src/imageio/imageio_libraw.c
@@ -289,7 +289,7 @@ static gboolean _supported_image(const gchar *filename)
   // At the moment of writing this code CR3 files are not supported by RawSpeed,
   // so they are always processed by LibRaw.
   gchar *extensions_whitelist;
-  const gchar *always_by_libraw = "cr3";
+  const gchar *always_by_libraw = "cr3 x3f";
 
   gchar *ext = g_strrstr(filename, ".");
   if(!ext)