diff --git a/src/renderers/WebGLCubeRenderTarget.js b/src/renderers/WebGLCubeRenderTarget.js
index 446ec015fb313e..1e5fd1f6d8e11b 100644
--- a/src/renderers/WebGLCubeRenderTarget.js
+++ b/src/renderers/WebGLCubeRenderTarget.js
@@ -1,4 +1,4 @@
-import { BackSide, LinearFilter, LinearMipmapLinearFilter, NoBlending, RGBAFormat } from '../constants.js';
+import { BackSide, LinearFilter, LinearMipmapLinearFilter, NoBlending } from '../constants.js';
 import { Mesh } from '../objects/Mesh.js';
 import { BoxGeometry } from '../geometries/BoxGeometry.js';
 import { ShaderMaterial } from '../materials/ShaderMaterial.js';
@@ -36,7 +36,6 @@ class WebGLCubeRenderTarget extends WebGLRenderTarget {
 	fromEquirectangularTexture( renderer, texture ) {
 
 		this.texture.type = texture.type;
-		this.texture.format = RGBAFormat; // see #18859
 		this.texture.encoding = texture.encoding;
 
 		this.texture.generateMipmaps = texture.generateMipmaps;
diff --git a/src/renderers/webgl/WebGLMorphtargets.js b/src/renderers/webgl/WebGLMorphtargets.js
index e8205aab7dbd84..b8d5fe6a45e5eb 100644
--- a/src/renderers/webgl/WebGLMorphtargets.js
+++ b/src/renderers/webgl/WebGLMorphtargets.js
@@ -1,4 +1,4 @@
-import { FloatType, RGBAFormat } from '../../constants.js';
+import { FloatType } from '../../constants.js';
 import { DataArrayTexture } from '../../textures/DataArrayTexture.js';
 import { Vector4 } from '../../math/Vector4.js';
 import { Vector2 } from '../../math/Vector2.js';
@@ -89,7 +89,6 @@ function WebGLMorphtargets( gl, capabilities, textures ) {
 				const buffer = new Float32Array( width * height * 4 * morphTargetsCount );
 
 				const texture = new DataArrayTexture( buffer, width, height, morphTargetsCount );
-				texture.format = RGBAFormat; // using RGBA since RGB might be emulated (and is thus slower)
 				texture.type = FloatType;
 				texture.needsUpdate = true;
 
diff --git a/src/renderers/webgl/WebGLShadowMap.js b/src/renderers/webgl/WebGLShadowMap.js
index 4f6e1be07fbd9f..e208280dfaf7fb 100644
--- a/src/renderers/webgl/WebGLShadowMap.js
+++ b/src/renderers/webgl/WebGLShadowMap.js
@@ -1,4 +1,4 @@
-import { FrontSide, BackSide, DoubleSide, RGBAFormat, NearestFilter, LinearFilter, PCFShadowMap, VSMShadowMap, RGBADepthPacking, NoBlending } from '../../constants.js';
+import { FrontSide, BackSide, DoubleSide, RGBAFormat, NearestFilter, PCFShadowMap, VSMShadowMap, RGBADepthPacking, NoBlending } from '../../constants.js';
 import { WebGLRenderTarget } from '../WebGLRenderTarget.js';
 import { MeshDepthMaterial } from '../../materials/MeshDepthMaterial.js';
 import { MeshDistanceMaterial } from '../../materials/MeshDistanceMaterial.js';
@@ -133,12 +133,10 @@ function WebGLShadowMap( _renderer, _objects, _capabilities ) {
 
 			if ( shadow.map === null && ! shadow.isPointLightShadow && this.type === VSMShadowMap ) {
 
-				const pars = { minFilter: LinearFilter, magFilter: LinearFilter, format: RGBAFormat };
-
-				shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
+				shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y );
 				shadow.map.texture.name = light.name + '.shadowMap';
 
-				shadow.mapPass = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
+				shadow.mapPass = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y );
 
 				shadow.camera.updateProjectionMatrix();