diff --git a/src/info.c b/src/info.c
index 3824731d1..f4a17b28b 100644
--- a/src/info.c
+++ b/src/info.c
@@ -543,6 +543,7 @@ char sprnames[NUMSPRITES + 1][5] =
 	"KINF", // Invincibility flash
 	"INVI", // Invincibility speedlines
 	"ICAP", // Item capsules
+	"IMON", // Item Monitor
 	"MGBX", // Heavy Magician transform box
 	"MGBT", // Heavy Magician transform box top
 	"MGBB", // Heavy Magician transform box bottom
diff --git a/src/info.h b/src/info.h
index 4425b4dc8..35a050011 100644
--- a/src/info.h
+++ b/src/info.h
@@ -1089,6 +1089,7 @@ typedef enum sprite
 	SPR_KINF, // Invincibility flash
 	SPR_INVI, // Invincibility speedlines
 	SPR_ICAP, // Item capsules
+	SPR_IMON, // Item Monitor
 	SPR_MGBX, // Heavy Magician transform box
 	SPR_MGBT, // Heavy Magician transform box top
 	SPR_MGBB, // Heavy Magician transform box bottom