diff --git a/src/usdGeom.cc b/src/usdGeom.cc
index d3797f38..e59d30e8 100644
--- a/src/usdGeom.cc
+++ b/src/usdGeom.cc
@@ -680,7 +680,7 @@ bool GPrim::set_primvar(const GeomPrimvar &primvar,
   return true;
 }
 
-bool GPrim::get_displayColor(value::color3f *dst, double t, const value::TimeSampleInterpolationType tinterp)
+bool GPrim::get_displayColor(value::color3f *dst, double t, const value::TimeSampleInterpolationType tinterp) const
 {
   // TODO: timeSamples
   (void)t;
@@ -696,7 +696,7 @@ bool GPrim::get_displayColor(value::color3f *dst, double t, const value::TimeSam
   return primvar.get_value(dst);
 }
 
-bool GPrim::get_displayOpacity(float *dst, double t, const value::TimeSampleInterpolationType tinterp)
+bool GPrim::get_displayOpacity(float *dst, double t, const value::TimeSampleInterpolationType tinterp) const
 {
   // TODO: timeSamples
   (void)t;
diff --git a/src/usdGeom.hh b/src/usdGeom.hh
index 8163fa1c..3903e6ec 100644
--- a/src/usdGeom.hh
+++ b/src/usdGeom.hh
@@ -359,9 +359,9 @@ struct GPrim : Xformable, MaterialBinding, Collection {
       Purpose::Default};  // "uniform token purpose"
 
   // Handy API to get `primvars:displayColor` and `primvars:displayOpacity`
-  bool get_displayColor(value::color3f *col, const double t = value::TimeCode::Default(), const value::TimeSampleInterpolationType tinterp = value::TimeSampleInterpolationType::Linear);
+  bool get_displayColor(value::color3f *col, const double t = value::TimeCode::Default(), const value::TimeSampleInterpolationType tinterp = value::TimeSampleInterpolationType::Linear) const;
 
-  bool get_displayOpacity(float *opacity, const double t = value::TimeCode::Default(), const value::TimeSampleInterpolationType tinterp = value::TimeSampleInterpolationType::Linear);
+  bool get_displayOpacity(float *opacity, const double t = value::TimeCode::Default(), const value::TimeSampleInterpolationType tinterp = value::TimeSampleInterpolationType::Linear) const;
 
   RelationshipProperty proxyPrim;