diff --git a/src/spicelib/analysis/relananalysis.c b/src/spicelib/analysis/relananalysis.c
index bef3d9ce4..4a9dc3934 100644
--- a/src/spicelib/analysis/relananalysis.c
+++ b/src/spicelib/analysis/relananalysis.c
@@ -24,6 +24,7 @@ extern struct dbcomm *dbs;
 #include "ngspice/miftypes.h"
 
 #include "ngspice/evt.h"
+#include "ngspice/enh.h"
 #include "ngspice/mif.h"
 #include "ngspice/evtproto.h"
 #include "ngspice/ipctiein.h"