diff --git a/libisofs/builder.c b/libisofs/builder.c
index 226e185..4b3ac61 100644
--- a/libisofs/builder.c
+++ b/libisofs/builder.c
@@ -215,6 +215,9 @@ int default_create_node(IsoNodeBuilder *builder, IsoImage *image,
             }
         }
         break;
+    default:
+        ret = ISO_BAD_FSRC_FILETYPE;
+        goto ex;
     }
     
     if (ret < 0)
diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index 489c413..994d08b 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -8712,6 +8712,8 @@ int iso_conv_name_chars(IsoWriteOpts *opts, char *name, size_t name_len,
 /** General note                                          (NOTE, HIGH, -414) */
 #define ISO_GENERAL_NOTE            0xB030FE62
 
+/** Unrecognized file type of IsoFileSrc object          (SORRY, HIGH, -415) */
+#define ISO_BAD_FSRC_FILETYPE       0xE030FE61
 
 /* Internal developer note: 
    Place new error codes directly above this comment. 
diff --git a/libisofs/messages.c b/libisofs/messages.c
index 9675368..7d4d16e 100644
--- a/libisofs/messages.c
+++ b/libisofs/messages.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2007 Vreixo Formoso
- * Copyright (c) 2009 - 2014 Thomas Schmitt
+ * Copyright (c) 2009 - 2015 Thomas Schmitt
  *
  * This file is part of the libisofs project; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2 
@@ -541,6 +541,8 @@ const char *iso_error_to_msg(int errcode)
         return "File name truncation length changed by loaded image info";
     case ISO_GENERAL_NOTE:
         return "A general note message was issued";
+    case ISO_BAD_FSRC_FILETYPE:
+        return "Unrecognized file type of IsoFileSrc object";
     default:
         return "Unknown error";
     }