diff --git a/packages/node_modules/@node-red/nodes/core/function/89-delay.html b/packages/node_modules/@node-red/nodes/core/function/89-delay.html
index 3ae4637d7..8ee404924 100644
--- a/packages/node_modules/@node-red/nodes/core/function/89-delay.html
+++ b/packages/node_modules/@node-red/nodes/core/function/89-delay.html
@@ -114,7 +114,8 @@
             timeout: {value:"5", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
             timeoutUnits: {value:"seconds"},
             rate: {value:"1", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
-            nbRateUnits: {value:"1", required:false, validate:RED.validators.regex(/\d+|/)},
+            nbRateUnits: {value:"1", required:false,
+                          validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
             rateUnits: {value: "second"},
             randomFirst: {value:"1", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},
             randomLast: {value:"5", required:true, validate:function(v) { return RED.validators.number(v) && (v >= 0); }},