diff --git a/src/OpenColorIO/GpuShaderClassWrapper.cpp b/src/OpenColorIO/GpuShaderClassWrapper.cpp
index e0c075a11d..6ca5027ee5 100644
--- a/src/OpenColorIO/GpuShaderClassWrapper.cpp
+++ b/src/OpenColorIO/GpuShaderClassWrapper.cpp
@@ -66,10 +66,7 @@ std::string OSLShaderClassWrapper::getClassWrapperHeader(const std::string& orig
     st.newLine() << "vector4 __operator__mul__(matrix m, vector4 v)";
     st.newLine() << "{";
     st.indent();
-    st.newLine() << "return vector4(v.x * m[0][0] + v.y * m[0][1] + v.z * m[0][2] + v.w * m[0][3], ";
-    st.newLine() << "               v.x * m[1][0] + v.y * m[1][1] + v.z * m[1][2] + v.w * m[1][3], ";
-    st.newLine() << "               v.x * m[2][0] + v.y * m[2][1] + v.z * m[2][2] + v.w * m[2][3], ";
-    st.newLine() << "               v.x * m[3][0] + v.y * m[3][1] + v.z * m[3][2] + v.w * m[3][3]);";
+    st.newLine() << "return transform(m, v);";
     st.dedent();
     st.newLine() << "}";
 
diff --git a/src/OpenColorIO/GpuShaderUtils.cpp b/src/OpenColorIO/GpuShaderUtils.cpp
index c3558418f2..f8cbc88907 100644
--- a/src/OpenColorIO/GpuShaderUtils.cpp
+++ b/src/OpenColorIO/GpuShaderUtils.cpp
@@ -955,7 +955,7 @@ std::string matrix3Mul(const T * m3x3, const std::string & vecName, GpuLanguage
         }
         case LANGUAGE_OSL_1:
         {
-            kw << "matrix(" << getMatrixValues<T, 3>(m3x3, lang, false) << ") * " << vecName;
+            kw << "matrix(" << getMatrixValues<T, 3>(m3x3, lang, true) << ") * " << vecName;
             break;
         }
         case GPU_LANGUAGE_MSL_2_0:
@@ -1021,7 +1021,7 @@ std::string matrix4Mul(const T * m4x4, const std::string & vecName, GpuLanguage
         }
         case LANGUAGE_OSL_1:
         {
-            kw << "matrix(" << getMatrixValues<T, 4>(m4x4, lang, false) << ") * " << vecName;
+            kw << "matrix(" << getMatrixValues<T, 4>(m4x4, lang, true) << ") * " << vecName;
             break;
         }
         case GPU_LANGUAGE_MSL_2_0: