diff --git a/docs/source/Support/bskKnownIssues.rst b/docs/source/Support/bskKnownIssues.rst
index d9de4506f30..36e30d94543 100644
--- a/docs/source/Support/bskKnownIssues.rst
+++ b/docs/source/Support/bskKnownIssues.rst
@@ -24,6 +24,9 @@ Version |release|
   3.7 upgrade.
 - Monte Carlo now applies nested dispersion paths and randomized ``RNGSeed`` modifications to the actual
   simulation objects.
+- The :ref:`linearTranslationNDOFStateEffector` getter assertion no longer references the spinning-body-only
+  degree-of-freedom counter, fixing source builds where that assertion is compiled. The related
+  :ref:`spinningBodyNDOFStateEffector` getter assertion now rejects the first out-of-range index.
 - SWIG 4.4.0 caused Basilisk build failures in some Python 3.13+ source-build configurations.
   Basilisk now requires SWIG 4.4.1 or a newer supported 4.x release, which provides SWIG ABI 5 support
   for Basilisk and compatible plugins. If source builds fail with SWIG 4.4.0 or emit
diff --git a/docs/source/Support/bskReleaseNotesSnippets/linear-translation-ndof-getter-build.rst b/docs/source/Support/bskReleaseNotesSnippets/linear-translation-ndof-getter-build.rst
new file mode 100644
index 00000000000..13e81c6f5b7
--- /dev/null
+++ b/docs/source/Support/bskReleaseNotesSnippets/linear-translation-ndof-getter-build.rst
@@ -0,0 +1 @@
+- Fixed N-DoF getter assertions in :ref:`linearTranslationNDOFStateEffector` and :ref:`spinningBodyNDOFStateEffector`.
diff --git a/src/simulation/dynamics/linearTranslationalBodies/linearTranslationBodiesNDOF/linearTranslationNDOFStateEffector.cpp b/src/simulation/dynamics/linearTranslationalBodies/linearTranslationBodiesNDOF/linearTranslationNDOFStateEffector.cpp
index 06631b1221a..dd041982987 100644
--- a/src/simulation/dynamics/linearTranslationalBodies/linearTranslationBodiesNDOF/linearTranslationNDOFStateEffector.cpp
+++ b/src/simulation/dynamics/linearTranslationalBodies/linearTranslationBodiesNDOF/linearTranslationNDOFStateEffector.cpp
@@ -110,7 +110,7 @@ void LinearTranslationNDOFStateEffector::addTranslatingBody(const std::shared_pt
 
 /*! This method is used to get a translating body. */
 std::shared_ptr<TranslatingBody> LinearTranslationNDOFStateEffector::getTranslatingBody(uint64_t index) {
-    assert(("Index can't be greater than the number of degrees of freedom of the effector", index <= this->numberOfDegreesOfFreedom));
+    assert(("Index must be less than the number of translating body axes", index < static_cast<uint64_t>(this->N)));
 
     return this->translatingBodyVec.at(index);
 }
diff --git a/src/simulation/dynamics/spinningBodies/spinningBodiesNDOF/spinningBodyNDOFStateEffector.cpp b/src/simulation/dynamics/spinningBodies/spinningBodiesNDOF/spinningBodyNDOFStateEffector.cpp
index a187de8d894..fb69f9f17ff 100644
--- a/src/simulation/dynamics/spinningBodies/spinningBodiesNDOF/spinningBodyNDOFStateEffector.cpp
+++ b/src/simulation/dynamics/spinningBodies/spinningBodiesNDOF/spinningBodyNDOFStateEffector.cpp
@@ -113,7 +113,8 @@ void SpinningBodyNDOFStateEffector::addSpinningBody(const std::shared_ptr<Spinni
 }
 
 std::shared_ptr<SpinningBody> SpinningBodyNDOFStateEffector::getSpinningBody(uint64_t index) {
-    assert(("Index can't be greater than the number of degrees of freedom of the effector", index <= this->numberOfDegreesOfFreedom));
+    assert(("Index must be less than the number of degrees of freedom of the effector",
+            index < static_cast<uint64_t>(this->numberOfDegreesOfFreedom)));
 
     return this->spinningBodyVec.at(index);
 }