diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 006ef6475834a..35c540fa14fa6 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -1236,8 +1236,6 @@ namespace ts {
                 return oldProgram.structureIsReused = StructureIsReused.Not;
             }
 
-            Debug.assert(!(oldProgram.structureIsReused! & (StructureIsReused.Completely | StructureIsReused.SafeModules)));
-
             // there is an old program, check if we can reuse its structure
             const oldRootNames = oldProgram.getRootFileNames();
             if (!arrayIsEqualTo(oldRootNames, rootNames)) {