diff --git a/libcxx/include/module.modulemap b/libcxx/include/module.modulemap
--- a/libcxx/include/module.modulemap
+++ b/libcxx/include/module.modulemap
@@ -157,6 +157,13 @@
       header "csetjmp"
       export *
     }
+    // NOTE: ensure that `ctime` preceeds `csignal` as otherwise, for a
+    // non-modular C runtime, you would end up with `csignal` providing time
+    // functions.
+    module ctime {
+      header "ctime"
+      export *
+    }
     module csignal {
       header "csignal"
       export *
@@ -197,10 +204,6 @@
       export cmath
       export *
     }
-    module ctime {
-      header "ctime"
-      export *
-    }
     // FIXME: <cuchar> is missing.
     module cwchar {
       header "cwchar"