diff --git a/S10-packages/precompilation.t b/S10-packages/precompilation.t
index 4a6e7fff2f..d39cdc7b87 100644
--- a/S10-packages/precompilation.t
+++ b/S10-packages/precompilation.t
@@ -3,7 +3,7 @@ use lib 't/spec/packages';
 use Test;
 use Test::Util;
 
-plan 40;
+plan 41;
 
 my @*MODULES; # needed for calling CompUnit::Repository::need directly
 my $precomp-ext    := $*VM.precomp-ext;
@@ -205,3 +205,15 @@ is-deeply @keys2, [<C D E F H K N P R S>], 'Twisty maze of dependencies, all dif
        :compiler-args['-I', 't/spec/packages', '-M', 'RT127176'],
        'no duplicate compilation error';
 }
+
+# RT #128156
+{
+    # precompile it in a different process
+    run $*EXECUTABLE,'-I','t/spec/packages','-e','use RT128156::One;';
+    # trigger recompilation
+    my $trigger-file = 't/spec/packages/RT128156/Two.pm6'.IO;
+    $trigger-file.IO.spurt($trigger-file.slurp);
+    my $comp-unit = $*REPO.need(CompUnit::DependencySpecification.new(:short-name<RT128156::One>));
+    ok $comp-unit.handle.globalish-package.WHO<RT128156>.WHO<One Two Three>:exists.all,
+       'GLOBAL symbols exist after re-precompiled';
+}
diff --git a/packages/RT128156/One.pm6 b/packages/RT128156/One.pm6
new file mode 100644
index 0000000000..464ff93261
--- /dev/null
+++ b/packages/RT128156/One.pm6
@@ -0,0 +1,2 @@
+class RT128156::One {};
+need RT128156::Two;
diff --git a/packages/RT128156/Three.pm6 b/packages/RT128156/Three.pm6
new file mode 100644
index 0000000000..1b83a59454
--- /dev/null
+++ b/packages/RT128156/Three.pm6
@@ -0,0 +1,2 @@
+# Empty
+class RT128156::Three {};
diff --git a/packages/RT128156/Two.pm6 b/packages/RT128156/Two.pm6
new file mode 100644
index 0000000000..4c1c618dd9
--- /dev/null
+++ b/packages/RT128156/Two.pm6
@@ -0,0 +1,3 @@
+need RT128156::Three;
+
+class RT128156::Two {};