diff --git a/engines/myst3/script.cpp b/engines/myst3/script.cpp
index d4752fe3f3a..315d711d26d 100644
--- a/engines/myst3/script.cpp
+++ b/engines/myst3/script.cpp
@@ -1126,6 +1126,20 @@ void Script::varDecrementMin(Context &c, const Opcode &cmd) {
 	_vm->_state->setVar(cmd.args[0], value);
 }
 
+void Script::varDecrementMinLooping(Context &c, const Opcode &cmd) {
+	debugC(kDebugScript, "Opcode %d: Decrement var %d in range [%d, %d]",
+			cmd.op, cmd.args[0], cmd.args[1], cmd.args[2]);
+
+	int32 value = _vm->_state->getVar(cmd.args[0]);
+
+	value--;
+
+	if (value < cmd.args[1])
+		value = cmd.args[2];
+
+	_vm->_state->setVar(cmd.args[0], value);
+}
+
 void Script::varAddValueMax(Context &c, const Opcode &cmd) {
 	debugC(kDebugScript, "Opcode %d: Add value %d to var %d with max value %d",
 			cmd.op, cmd.args[0], cmd.args[1], cmd.args[2]);
diff --git a/engines/myst3/script.h b/engines/myst3/script.h
index 94aa1b566db..4727fb4d25f 100644
--- a/engines/myst3/script.h
+++ b/engines/myst3/script.h
@@ -176,6 +176,7 @@ private:
 	DECLARE_OPCODE(varAddValueMaxLooping);
 	DECLARE_OPCODE(varDecrement);
 	DECLARE_OPCODE(varDecrementMin);
+	DECLARE_OPCODE(varDecrementMinLooping);
 	DECLARE_OPCODE(varAddValueMax);
 	DECLARE_OPCODE(varSubValueMin);
 	DECLARE_OPCODE(varZeroRange);