diff --git a/script.cpp b/script.cpp
index 53f27546247..069d8ccb40e 100644
--- a/script.cpp
+++ b/script.cpp
@@ -366,6 +366,12 @@ void Scumm::writeVar(uint var, int value)
 		var &= 0x7FFF;
 		checkRange(_numBitVariables - 1, 0, var,
 							 "Bit variable %d out of range(w)");
+
+		/* FIXME: Enable Indy4 mousefighting by default. 
+				  is there a better place to put this? */
+		if (_gameId == GID_INDY4 && var == 107 && vm.slot[_currentScript].number == 1)
+			value = 1;
+
 		if (value)
 			_bitVars[var >> 3] |= (1 << (var & 7));
 		else