diff --git a/lib/mayaUsd/render/MaterialXGenOgsXml/GlslFragmentGenerator.cpp b/lib/mayaUsd/render/MaterialXGenOgsXml/GlslFragmentGenerator.cpp
index 028c1fb646..23cd2f9443 100644
--- a/lib/mayaUsd/render/MaterialXGenOgsXml/GlslFragmentGenerator.cpp
+++ b/lib/mayaUsd/render/MaterialXGenOgsXml/GlslFragmentGenerator.cpp
@@ -386,9 +386,7 @@ ShaderPtr GlslFragmentGenerator::generate(
         }
 
         // Add all function calls (varies greatly by MaterialX version)
-#if MX_COMBINED_VERSION < 13803
-        emitFunctionCalls(graph, context, pixelStage);
-#else
+#if MX_COMBINED_VERSION >= 13805
         // Surface shaders need special handling.
         if (graph.hasClassification(
                 ShaderNode::Classification::SHADER | ShaderNode::Classification::SURFACE)) {
@@ -396,15 +394,6 @@ ShaderPtr GlslFragmentGenerator::generate(
             // closure/shader nodes and need to be emitted first.
             emitFunctionCalls(graph, context, pixelStage, ShaderNode::Classification::TEXTURE);
 
-#if MX_COMBINED_VERSION < 13805
-            // Emit function calls for all surface shader nodes.
-            // These will internally emit their closure function calls.
-            emitFunctionCalls(
-                graph,
-                context,
-                pixelStage,
-                ShaderNode::Classification::SHADER | ShaderNode::Classification::SURFACE);
-#else
             // Emit function calls for "root" closure/shader nodes.
             // These will internally emit function calls for any dependent closure nodes upstream.
             for (ShaderGraphOutputSocket* socket : graph.getOutputSockets()) {
@@ -417,12 +406,33 @@ ShaderPtr GlslFragmentGenerator::generate(
                     }
                 }
             }
-#endif
         } else {
             // No surface shader graph so just generate all
             // function calls in order.
             emitFunctionCalls(graph, context, pixelStage);
         }
+#elif MX_COMBINED_VERSION >= 13803
+        // Surface shaders need special handling.
+        if (graph.hasClassification(
+                ShaderNode::Classification::SHADER | ShaderNode::Classification::SURFACE)) {
+            // Emit all texturing nodes. These are inputs to any
+            // closure/shader nodes and need to be emitted first.
+            emitFunctionCalls(graph, context, pixelStage, ShaderNode::Classification::TEXTURE);
+
+            // Emit function calls for all surface shader nodes.
+            // These will internally emit their closure function calls.
+            emitFunctionCalls(
+                graph,
+                context,
+                pixelStage,
+                ShaderNode::Classification::SHADER | ShaderNode::Classification::SURFACE);
+        } else {
+            // No surface shader graph so just generate all
+            // function calls in order.
+            emitFunctionCalls(graph, context, pixelStage);
+        }
+#else
+        emitFunctionCalls(graph, context, pixelStage);
 #endif
 
         // Emit final result