diff --git a/codec/jp3d_to_volume.c b/codec/jp3d_to_volume.c
index a5614d71..b5c75756 100755
--- a/codec/jp3d_to_volume.c
+++ b/codec/jp3d_to_volume.c
@@ -205,6 +205,8 @@ int get_file_format(char *filename) {
 			}
 		}
 	}
+
+	return -1;
 }
 
 /* -------------------------------------------------------------------------- */