diff --git a/Source/objects.cpp b/Source/objects.cpp
index 3c570cfbd..73a344c90 100644
--- a/Source/objects.cpp
+++ b/Source/objects.cpp
@@ -3611,13 +3611,13 @@ void OperateSkelBook(int pnum, int i, BOOL sendmsg)
 	}
 }
 
-void OperateBookCase(int pnum, int i, BOOL sendmsg)
+void OperateBookCase(int pnum, int i, DIABOOL sendmsg)
 {
 	if (object[i]._oSelFlag != 0) {
 		if (!deltaload)
 			PlaySfxLoc(IS_ISCROL, object[i]._ox, object[i]._oy);
-		object[i]._oAnimFrame -= 2;
 		object[i]._oSelFlag = 0;
+		object[i]._oAnimFrame -= 2;
 		if (!deltaload) {
 			SetRndSeed(object[i]._oRndSeed);
 			CreateTypeItem(object[i]._ox, object[i]._oy, FALSE, ITYPE_MISC, IMISC_BOOK, sendmsg, FALSE);
diff --git a/Source/objects.h b/Source/objects.h
index d22ef32eb..548745368 100644
--- a/Source/objects.h
+++ b/Source/objects.h
@@ -126,7 +126,7 @@ void TryDisarm(int pnum, int i);
 int ItemMiscIdIdx(int imiscid);
 void OperateShrine(int pnum, int i, int sType);
 void OperateSkelBook(int pnum, int i, BOOL sendmsg);
-void OperateBookCase(int pnum, int i, BOOL sendmsg);
+void OperateBookCase(int pnum, int i, DIABOOL sendmsg);
 void OperateDecap(int pnum, int i, DIABOOL sendmsg);
 void OperateArmorStand(int pnum, int i, DIABOOL sendmsg);
 int FindValidShrine(int i);