diff --git a/implementations/Crafter.Build-Clang.cpp b/implementations/Crafter.Build-Clang.cpp
index 775096e..8ac6c40 100644
--- a/implementations/Crafter.Build-Clang.cpp
+++ b/implementations/Crafter.Build-Clang.cpp
@@ -255,7 +255,7 @@ BuildResult Crafter::Build(Configuration& config, std::unordered_map<fs::path, s
         fs::create_directories(outputDir);
     }
 
-    BuildResult buildResult;
+    BuildResult buildResult{};
 
     // glslang #include search paths for every shader compiled in this
     // configuration: each transitive (incl. self) buildFiles entry's parent
@@ -931,6 +931,41 @@ BuildResult Crafter::Build(Configuration& config, std::unordered_map<fs::path, s
                     break;
                 }
             }
+            // Also relink if any .o this archive bundles is newer than the
+            // archive itself. Covers a build that compiled the .o but never
+            // reached the link step (interrupt, crash, or a source touched
+            // after compile but before link): on the next run the .cpp is
+            // already ≤ .o so Implementation/Module Check returns false and
+            // nothing else would notice the archive is stale.
+            if (!buildResult.repack) {
+                auto objNewer = [&](const fs::path& obj) {
+                    std::error_code ec;
+                    auto t = fs::last_write_time(obj, ec);
+                    return !ec && t > consumerMtime;
+                };
+                for (const std::unique_ptr<Module>& iface : config.interfaces) {
+                    if (objNewer(buildDir / (iface->path.filename().string() + ".o"))) {
+                        buildResult.repack = true;
+                        break;
+                    }
+                    bool partHit = false;
+                    for (const std::unique_ptr<ModulePartition>& part : iface->partitions) {
+                        if (objNewer(buildDir / (part->path.filename().string() + ".o"))) {
+                            partHit = true;
+                            break;
+                        }
+                    }
+                    if (partHit) { buildResult.repack = true; break; }
+                }
+                if (!buildResult.repack) {
+                    for (const Implementation& impl : config.implementations) {
+                        if (objNewer(buildDir / (impl.path.filename().string() + "_impl.o"))) {
+                            buildResult.repack = true;
+                            break;
+                        }
+                    }
+                }
+            }
         }
     }