diff --git a/Rez/Expression.cc b/Rez/Expression.cc
index e93bec695a..259cde21f3 100644
--- a/Rez/Expression.cc
+++ b/Rez/Expression.cc
@@ -130,12 +130,26 @@ int IdentifierExpr::evaluateInt(ResourceCompiler *ctx)
 	}
 	else
 	{
-		ExprPtr val = ctx->lookupIdentifier(id);
+		Subscripts sub;
+		for(auto arg : arguments)
+			sub.addSubscript(arg->evaluateInt(ctx));
+		ExprPtr val = ctx->lookupIdentifier(id, sub);
 		assert(val);
 		return val->evaluateInt(ctx);
 	}
 }
 
+std::string IdentifierExpr::evaluateString(ResourceCompiler *ctx)
+{
+	assert(!isFunction);
+	Subscripts sub;
+	for(auto arg : arguments)
+		sub.addSubscript(arg->evaluateInt(ctx));
+	ExprPtr val = ctx->lookupIdentifier(id, sub);
+	assert(val);
+	return val->evaluateString(ctx);
+}
+
 
 CaseExpr::CaseExpr(const std::string &tag, CompoundExprPtr expr)
 	: tag(tag), expr(expr)
diff --git a/Rez/Expression.h b/Rez/Expression.h
index 9b4ec6b444..acc417e759 100644
--- a/Rez/Expression.h
+++ b/Rez/Expression.h
@@ -111,6 +111,7 @@ public:
 
 	void addArgument(ExprPtr e);
 	virtual int evaluateInt(ResourceCompiler *ctx);
+	virtual std::string evaluateString(ResourceCompiler *ctx);
 };
 
 #endif // EXPRESSION_H