diff --git a/Gems/PhysX/Code/Source/Pipeline/MeshExporter.cpp b/Gems/PhysX/Code/Source/Pipeline/MeshExporter.cpp
index 3aeb3ad797..56042fbc91 100644
--- a/Gems/PhysX/Code/Source/Pipeline/MeshExporter.cpp
+++ b/Gems/PhysX/Code/Source/Pipeline/MeshExporter.cpp
@@ -794,6 +794,9 @@ namespace PhysX
                         );
                     }
 
+                    // Convex and primitive methods can only have 1 material
+                    const bool limitToOneMaterial = pxMeshGroup.GetExportAsConvex() || pxMeshGroup.GetExportAsPrimitive();
+
                     for (AZ::u32 faceIndex = 0; faceIndex < faceCount; ++faceIndex)
                     {
                         AZStd::string materialName = DefaultMaterialName;
@@ -810,6 +813,14 @@ namespace PhysX
                             }
 
                             materialName = localFbxMaterialsList[materialId];
+
+                            // Keep using the first material when it has to be limited to one.
+                            if (limitToOneMaterial &&
+                                assetMaterialData.m_fbxMaterialNames.size() == 1 &&
+                                assetMaterialData.m_fbxMaterialNames[0] != materialName)
+                            {
+                                materialName = assetMaterialData.m_fbxMaterialNames[0];
+                            }
                         }
 
                         const AZ::SceneAPI::DataTypes::IMeshData::Face& face = nodeMesh->GetFaceInfo(faceIndex);