diff --git a/.kiro/specs/dirty-content-fingerprint/tasks.md b/.kiro/specs/dirty-content-fingerprint/tasks.md
index 93dc1f8a..d3141d2f 100644
--- a/.kiro/specs/dirty-content-fingerprint/tasks.md
+++ b/.kiro/specs/dirty-content-fingerprint/tasks.md
@@ -47,9 +47,9 @@
   - _Requirements: 1.1, 5.1_
   - _Boundary: go_build script_
 
-- [ ] 4.2 (P) apiserver and xcecli meson builds pass the resolved value through
-  - Both `apiserver/meson.build` and `xcecli/meson.build` pass `XCE_DIRTY_FINGERPRINT` (from `get_option('dirty_fingerprint')`) into `go_build`'s env, matching the existing `XCE_GIT_COMMIT`/`XCE_BUILD_TIME` pattern exactly (same quoting behavior)
-  - Observable: a real commit-state fingerprint reaches `go build`'s actual invocation and is embedded in both binaries' Go build-info metadata (`go version -m`), once tasks 4.4/4.5 declare the consuming var
+- [x] 4.2 (P) apiserver and xcecli meson builds pass the resolved value through
+  - Both `apiserver/meson.build` and `xcecli/meson.build` add `'XCE_DIRTY_FINGERPRINT=' + get_option('dirty_fingerprint')`, unquoted, identically positioned to the existing `XCE_GIT_COMMIT`/`XCE_BUILD_TIME` entries
+  - Observable confirmed live (independently re-verified by review with a distinct test value, fresh configure, and real `ninja` builds of both binaries): the value reaches `go build`'s real invocation and shows up in `go version -m`'s recorded `-ldflags` build setting for both apiserver and xcecli; matches the C-side `-DVERSION_DIRTY_FINGERPRINT=` byte-for-byte from the same configure; degrades to empty identically to the two pre-existing vars when omitted
   - _Requirements: 1.1, 4.1_
   - _Boundary: apiserver/meson.build, xcecli/meson.build_
   - _Depends: 4.1_
diff --git a/src/frontend/apiserver/meson.build b/src/frontend/apiserver/meson.build
index 34398cb1..c8ecde81 100644
--- a/src/frontend/apiserver/meson.build
+++ b/src/frontend/apiserver/meson.build
@@ -58,6 +58,7 @@ custom_target('apiserver',
             'BUILD_ROOT="@BUILD_ROOT@"',
             'XCE_GIT_COMMIT=' + get_option('commit_id'),
             'XCE_BUILD_TIME=' + get_option('build_time'),
+            'XCE_DIRTY_FINGERPRINT=' + get_option('dirty_fingerprint'),
             go_build_program,
             '@INPUT@', '@OUTPUT@'],
   env:     go_env,
diff --git a/src/frontend/xcecli/meson.build b/src/frontend/xcecli/meson.build
index e6226298..8abb9e04 100644
--- a/src/frontend/xcecli/meson.build
+++ b/src/frontend/xcecli/meson.build
@@ -14,6 +14,7 @@ custom_target('xcecli',
             'BUILD_ROOT="@BUILD_ROOT@"',
             'XCE_GIT_COMMIT=' + get_option('commit_id'),
             'XCE_BUILD_TIME=' + get_option('build_time'),
+            'XCE_DIRTY_FINGERPRINT=' + get_option('dirty_fingerprint'),
             go_build_program,
             '@INPUT@', '@OUTPUT@'],
   env:     go_env,