diff --git a/src/common.js.ts b/src/common.js.ts
index a2d0b3e..60f6a19 100644
--- a/src/common.js.ts
+++ b/src/common.js.ts
@@ -298,7 +298,7 @@ function raiseWarning(issue: OperationOutcomeIssue, failOnWarning:boolean): bool
     // COMMENT WAS: TODO this needs to be turned to true 1/8/2022 Warnings not acceptable on NHS Digital resources
     // Actual comment is: if error not handled above, return error if FailOnWarning is true 
     if (!failOnWarning) {
-        process.env.SKIPPEDWARNINGS ++
+        process.env.SKIPPEDWARNINGS +=1;
     }
     return failOnWarning;
 }