diff --git a/src/mu-maildir.c b/src/mu-maildir.c
index 9599aa53..cce2e21e 100644
--- a/src/mu-maildir.c
+++ b/src/mu-maildir.c
@@ -828,7 +828,7 @@ mu_maildir_move_message (const char* oldpath, const char* targetmdir,
 	}
 
 	if (g_strcmp0 (oldpath, newfullpath) == 0) {
-		g_set_error (err, 0, MU_ERROR_FILE,
+		g_set_error (err, 0, MU_ERROR_FILE_TARGET_EQUALS_SOURCE,
 			     "target equals source");
 		return FALSE;
 	}
diff --git a/src/mu-util.h b/src/mu-util.h
index 722ebe03..acbaaf65 100644
--- a/src/mu-util.h
+++ b/src/mu-util.h
@@ -441,7 +441,8 @@ enum _MuError {
 	MU_ERROR_FILE_STAT_FAILED             = 77,
 	MU_ERROR_FILE_READDIR_FAILED          = 78,
 	MU_ERROR_FILE_INVALID_SOURCE          = 79,
-
+	MU_ERROR_FILE_TARGET_EQUALS_SOURCE    = 80,
+	
 	/* not really an error, used in callbacks */
 	MU_STOP                               = 99,
 };