diff --git a/src/ca65/expr.c b/src/ca65/expr.c
index b3e2b3617..b39f0655f 100644
--- a/src/ca65/expr.c
+++ b/src/ca65/expr.c
@@ -751,7 +751,7 @@ static ExprNode* FuncXMatch (void)
 
 static ExprNode* Function (ExprNode* (*F) (void))
 /* Handle builtin functions */
-{            
+{
     ExprNode* E;
 
     /* Skip the keyword */
@@ -810,6 +810,11 @@ static ExprNode* Factor (void)
 	    NextTok ();
 	    break;
 
+        case TOK_PLUS:
+            NextTok ();
+            N = Factor ();
+            break;
+
 	case TOK_MINUS:
 	    NextTok ();
             L = Factor ();