diff --git a/source/blender/io/usd/intern/usd_armature_utils.cc b/source/blender/io/usd/intern/usd_armature_utils.cc
index 477d465779f..38fba1dd825 100644
--- a/source/blender/io/usd/intern/usd_armature_utils.cc
+++ b/source/blender/io/usd/intern/usd_armature_utils.cc
@@ -35,7 +35,7 @@ FCurve *create_fcurve(blender::animrig::Channelbag &channelbag,
 }
 
 /* Utility: fill in a single fcurve sample at the provided index. */
-void set_fcurve_sample(FCurve *fcu, uint sample_index, const float frame, const float value)
+void set_fcurve_sample(FCurve *fcu, int64_t sample_index, const float frame, const float value)
 {
   BLI_assert(sample_index >= 0 && sample_index < fcu->totvert);
   BezTriple &bez = fcu->bezt[sample_index];
diff --git a/source/blender/io/usd/intern/usd_armature_utils.hh b/source/blender/io/usd/intern/usd_armature_utils.hh
index e42ad371974..d54b57fdf15 100644
--- a/source/blender/io/usd/intern/usd_armature_utils.hh
+++ b/source/blender/io/usd/intern/usd_armature_utils.hh
@@ -36,7 +36,7 @@ FCurve *create_fcurve(blender::animrig::Channelbag &channelbag,
                       const int sample_count);
 
 /* Utility: fill in a single fcurve sample at the provided index. */
-void set_fcurve_sample(FCurve *fcu, uint sample_index, const float frame, const float value);
+void set_fcurve_sample(FCurve *fcu, int64_t sample_index, const float frame, const float value);
 
 /**
  * Recursively invoke the given function on the given armature object's bones.