diff --git a/examples/js/loaders/GLTFLoader.js b/examples/js/loaders/GLTFLoader.js
index 07498109d93be2ef601b00cfbabb10f5d50d1a86..1c474c72207c27a896640122859c49e46f35908e 100644
--- a/examples/js/loaders/GLTFLoader.js
+++ b/examples/js/loaders/GLTFLoader.js
@@ -957,7 +957,7 @@ THREE.GLTFLoader = ( function () {
 					//  WebGLRenderTargetCube will be flipped for backwards compatibility
 					//  WebGLRenderTargetCube.texture will be flipped because it's a Texture and NOT a CubeTexture
 					// this check must be handled differently, or removed entirely, if WebGLRenderTargetCube uses a CubeTexture in the future
-					uniforms.flipEnvMap.value = ( ! ( material.envMap && material.envMap.isCubeTexture ) ) ? 1 : - 1;
+					uniforms.flipEnvMap.value = material.envMap.isCubeTexture ? - 1 : 1;
 
 					uniforms.reflectivity.value = material.reflectivity;
 					uniforms.refractionRatio.value = material.refractionRatio;
diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 7b760cf825ecf7491ca00cb9ccba5a9501073cea..47d7517e7cdf270fd7788a5c575495f8aaec5516 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1937,7 +1937,7 @@ function WebGLRenderer( parameters ) {
 			//  WebGLRenderTargetCube will be flipped for backwards compatibility
 			//  WebGLRenderTargetCube.texture will be flipped because it's a Texture and NOT a CubeTexture
 			// this check must be handled differently, or removed entirely, if WebGLRenderTargetCube uses a CubeTexture in the future
-			uniforms.flipEnvMap.value = ( ! ( material.envMap && material.envMap.isCubeTexture ) ) ? 1 : - 1;
+			uniforms.flipEnvMap.value = material.envMap.isCubeTexture ? - 1 : 1;
 
 			uniforms.reflectivity.value = material.reflectivity;
 			uniforms.refractionRatio.value = material.refractionRatio;