diff --git a/TunnelKitTests/Core/RoutingTests.swift b/TunnelKitTests/Core/RoutingTests.swift
index 13d5bc6..649defc 100644
--- a/TunnelKitTests/Core/RoutingTests.swift
+++ b/TunnelKitTests/Core/RoutingTests.swift
@@ -102,7 +102,9 @@ class RoutingTests: XCTestCase {
         let v6 = RoutingTableEntry(iPv6Network: "abcd:efef:120::/46", gateway: nil, networkInterface: "en0")
         let v6Boundary = RoutingTableEntry(iPv6Network: "abcd:efef:120::/127", gateway: nil, networkInterface: "en0")
         
-        let v4parts = v4.partitioned()
+        guard let v4parts = v4.partitioned() else {
+            fatalError()
+        }
         let v4parts1 = v4parts[0]
         let v4parts2 = v4parts[1]
         XCTAssertEqual(v4parts1.network(), "192.168.1.0")
@@ -110,7 +112,9 @@ class RoutingTests: XCTestCase {
         XCTAssertEqual(v4parts2.network(), "192.168.1.128")
         XCTAssertEqual(v4parts2.prefix(), 25)
 
-        let v6parts = v6.partitioned()
+        guard let v6parts = v6.partitioned() else {
+            fatalError()
+        }
         let v6parts1 = v6parts[0]
         let v6parts2 = v6parts[1]
         XCTAssertEqual(v6parts1.network(), "abcd:efef:120::")
@@ -118,7 +122,9 @@ class RoutingTests: XCTestCase {
         XCTAssertEqual(v6parts2.network(), "abcd:efef:122::")
         XCTAssertEqual(v6parts2.prefix(), 47)
 
-        let v4BoundaryParts = v4Boundary.partitioned()
+        guard let v4BoundaryParts = v4Boundary.partitioned() else {
+            fatalError()
+        }
         let v4BoundaryParts1 = v4BoundaryParts[0]
         let v4BoundaryParts2 = v4BoundaryParts[1]
         XCTAssertEqual(v4BoundaryParts1.network(), "192.168.1.0")
@@ -126,7 +132,9 @@ class RoutingTests: XCTestCase {
         XCTAssertEqual(v4BoundaryParts2.network(), "192.168.1.1")
         XCTAssertEqual(v4BoundaryParts2.prefix(), 32)
 
-        let v6BoundaryParts = v6Boundary.partitioned()
+        guard let v6BoundaryParts = v6Boundary.partitioned() else {
+            fatalError()
+        }
         let v6BoundaryParts1 = v6BoundaryParts[0]
         let v6BoundaryParts2 = v6BoundaryParts[1]
         XCTAssertEqual(v6BoundaryParts1.network(), "abcd:efef:120::")