diff --git a/src/spicelib/analysis/com_optran.h b/src/spicelib/analysis/com_optran.h
new file mode 100644
index 000000000..6cbe8ed99
--- /dev/null
+++ b/src/spicelib/analysis/com_optran.h
@@ -0,0 +1,6 @@
+#ifndef ngspice_COM_OPTRAN_H
+#define ngspice_COM_OPTRAN_H
+
+void com_optran(wordlist *wl);
+
+#endif