diff --git a/graphics/src/AssimpLoader_TEST.cc b/graphics/src/AssimpLoader_TEST.cc
index 3a42c0fc..6be2e579 100644
--- a/graphics/src/AssimpLoader_TEST.cc
+++ b/graphics/src/AssimpLoader_TEST.cc
@@ -669,7 +669,7 @@ TEST_F(AssimpLoader, LoadGlTF2BoxExternalTexture)
 // Open a gltf mesh with transmission extension
 TEST_F(AssimpLoader, LoadGlTF2BoxTransmission)
 {
-#ifdef GZ_ASSIMP_PRE_5_1_0
+#ifndef GZ_ASSIMP_PRE_5_1_0
   common::AssimpLoader loader;
   common::Mesh *mesh = loader.Load(
       common::testing::TestFile("data", "box_transmission.glb"));