diff --git a/crates/bevy_pbr/src/render_graph/pbr_pipeline/pbr.vert b/crates/bevy_pbr/src/render_graph/pbr_pipeline/pbr.vert
index 533a163a1c903..3a8471805b514 100644
--- a/crates/bevy_pbr/src/render_graph/pbr_pipeline/pbr.vert
+++ b/crates/bevy_pbr/src/render_graph/pbr_pipeline/pbr.vert
@@ -24,10 +24,24 @@ layout(set = 2, binding = 0) uniform Transform {
     mat4 Model;
 };
 
+// inverts the scaling, but keeps the rotation of a mat3
+// ! assumes that m is an orthogonal matrix
+mat3 to_normal_matrix(mat3 m) {
+    vec3 fac = 1.0 / vec3(
+    	dot(m[0], m[0]),
+    	dot(m[1], m[1]),
+    	dot(m[2], m[2])
+    );
+    m[0] *= fac.x;
+    m[1] *= fac.y;
+    m[2] *= fac.z;
+    return m;
+}
+
 void main() {
     vec4 world_position = Model * vec4(Vertex_Position, 1.0);
     v_WorldPosition = world_position.xyz;
-    v_WorldNormal = mat3(Model) * Vertex_Normal;
+    v_WorldNormal = to_normal_matrix(mat3(Model)) * Vertex_Normal;
     v_Uv = Vertex_Uv;
 #ifdef STANDARDMATERIAL_NORMAL_MAP
     v_WorldTangent = vec4(mat3(Model) * Vertex_Tangent.xyz, Vertex_Tangent.w);