diff --git a/implementations/Crafter.Build-Implementation.cpp b/implementations/Crafter.Build-Implementation.cpp
index ca39bac..6f0b355 100644
--- a/implementations/Crafter.Build-Implementation.cpp
+++ b/implementations/Crafter.Build-Implementation.cpp
@@ -51,8 +51,13 @@ namespace Crafter {
             return;
         }
 
-        // -MD leaves <name>_impl.o.d beside the object for Check to read.
-        std::string result = RunBuildCommand(std::format("{0} {1}.cpp -c -MD -MF {2}_impl.o.d -o {2}_impl.o", clang, path.string(), (buildDir/path.filename()).string()));
+        // -MD leaves <name>_impl.o.d beside the object for Check to read, and
+        // -fmodule-file-deps puts the BMIs the unit imported in it with the
+        // headers. The driver adds that for --precompile only, so a std
+        // module rebuilt in place, for a mingw-w64 or libc++ update under
+        // the same compiler, left the objects importing it as they were, and
+        // the next build only relinked them.
+        std::string result = RunBuildCommand(std::format("{0} {1}.cpp -c -MD -MF {2}_impl.o.d -fmodule-file-deps -o {2}_impl.o", clang, path.string(), (buildDir/path.filename()).string()));
 
         bool expected = false;
         if(!result.empty() && buildCancelled.compare_exchange_strong(expected, true)) {