diff --git a/Sources/XcodeDataModelSchema.swift b/Sources/XcodeDataModelSchema.swift
index e4db7ff..19a9819 100644
--- a/Sources/XcodeDataModelSchema.swift
+++ b/Sources/XcodeDataModelSchema.swift
@@ -145,7 +145,7 @@ public final class XcodeDataModelSchema: DynamicSchema {
     public required init(modelName: ModelVersion, modelVersionFileURL: URL) {
         
         CoreStore.assert(
-            NSManagedObjectModel(contentsOf: modelVersionFileURL) != nil,
+            FileManager.default.fileExists(atPath: modelVersionFileURL.path),
             "Could not find the \"\(modelName).mom\" version file for the model at URL \"\(modelVersionFileURL)\"."
         )
         
@@ -164,12 +164,13 @@ public final class XcodeDataModelSchema: DynamicSchema {
             
             return cachedRawModel
         }
-        if let rawModel = NSManagedObjectModel(contentsOf: self.modelVersionFileURL) {
-            
-            self.cachedRawModel = rawModel
-            return rawModel
-        }
-        CoreStore.abort("Could not create an \(cs_typeName(NSManagedObjectModel.self)) from the model at URL \"\(self.modelVersionFileURL)\".")
+        CoreStore.assert(
+            FileManager.default.fileExists(atPath: self.modelVersionFileURL.path),
+            "Could not find the \"\(self.modelVersion).mom\" version file for the model at URL \"\(self.modelVersionFileURL)\"."
+        )
+        let rawModel = NSManagedObjectModel(contentsOf: self.modelVersionFileURL)
+        self.cachedRawModel = rawModel
+        return rawModel
     }