diff --git a/packages/compiler-cli/src/transformers/program.ts b/packages/compiler-cli/src/transformers/program.ts
index 5f25218013..0b045509b6 100644
--- a/packages/compiler-cli/src/transformers/program.ts
+++ b/packages/compiler-cli/src/transformers/program.ts
@@ -73,7 +73,7 @@ class AngularCompilerProgram implements Program {
       private host: CompilerHost, oldProgram?: Program) {
     this.rootNames = [...rootNames];
 
-    if (ts.version < '2.7.2' || (ts.version >= '2.8.0' && !options.disableTypeScriptVersionCheck)) {
+    if ((ts.version < '2.7.2' || ts.version >= '2.8.0') && !options.disableTypeScriptVersionCheck) {
       throw new Error(
           `The Angular Compiler requires TypeScript >=2.7.2 and <2.8.0 but ${ts.version} was found instead.`);
     }