diff --git a/Source/control.cpp b/Source/control.cpp
index 70dbea0d1..63abb93be 100644
--- a/Source/control.cpp
+++ b/Source/control.cpp
@@ -1730,7 +1730,7 @@ char GetSBookTrans(int ii, BOOL townok)
 	if (plr[myplr]._pISpells & (__int64)1 << (ii - 1)) {
 		st = RSPLTYPE_CHARGES;
 	}
-	if (plr[myplr]._pAblSpells & 1 << (ii - 1)) { /// BUGFIX: missing (__int64)
+	if (plr[myplr]._pAblSpells & (__int64)1 << (ii - 1)) { /// BUGFIX: missing (__int64) (fixed)
 		st = RSPLTYPE_SKILL;
 	}
 	if (st == RSPLTYPE_SPELL) {