diff --git a/src/spicelib/devices/hicum2/hicum2defs.h b/src/spicelib/devices/hicum2/hicum2defs.h
index a2de5e227..7281ef00b 100644
--- a/src/spicelib/devices/hicum2/hicum2defs.h
+++ b/src/spicelib/devices/hicum2/hicum2defs.h
@@ -379,7 +379,7 @@ typedef struct sHICUMinstance {
 #define HICUMcqcth       HICUMstate+66 /* thermal capacitor current */
 
 #define HICUMvrth        HICUMstate+67
-#define HICUMicth_Vrth   HICUMstate+68
+#define HICUMicth_dT     HICUMstate+68
 
 #define HICUMvxf         HICUMstate+69
 #define HICUMqxf         HICUMstate+70