diff --git a/doc/includes/references.h b/doc/includes/references.h
index 00d9216d..8a54a54f 100644
--- a/doc/includes/references.h
+++ b/doc/includes/references.h
@@ -2265,7 +2265,7 @@ typedef struct mjsTexture_ {       // texture specification
   mjString* content_type;          // content type of file
   mjString* file;                  // png file to load; use for all sides of cube
   int gridsize[2];                 // size of grid for composite file; (1,1)-repeat
-  char gridlayout[13];             // row-major: L,R,F,B,U,D for faces; . for unused
+  char gridlayout[12];             // row-major: L,R,F,B,U,D for faces; . for unused
 
   // method 3: separate files
   mjStringVec* cubefiles;          // different file for each side of the cube
diff --git a/include/mujoco/mjspec.h b/include/mujoco/mjspec.h
index 170a1879..6c1ced28 100644
--- a/include/mujoco/mjspec.h
+++ b/include/mujoco/mjspec.h
@@ -549,7 +549,7 @@ typedef struct mjsTexture_ {       // texture specification
   mjString* content_type;          // content type of file
   mjString* file;                  // png file to load; use for all sides of cube
   int gridsize[2];                 // size of grid for composite file; (1,1)-repeat
-  char gridlayout[13];             // row-major: L,R,F,B,U,D for faces; . for unused
+  char gridlayout[12];             // row-major: L,R,F,B,U,D for faces; . for unused
 
   // method 3: separate files
   mjStringVec* cubefiles;          // different file for each side of the cube
diff --git a/python/mujoco/introspect/structs.py b/python/mujoco/introspect/structs.py
index d7ba4920..13ebbfce 100644
--- a/python/mujoco/introspect/structs.py
+++ b/python/mujoco/introspect/structs.py
@@ -8408,7 +8408,7 @@ STRUCTS: Mapping[str, StructDecl] = dict([
                  name='gridlayout',
                  type=ArrayType(
                      inner_type=ValueType(name='char'),
-                     extents=(13,),
+                     extents=(12,),
                  ),
                  doc='row-major: L,R,F,B,U,D for faces; . for unused',
              ),
diff --git a/wasm/codegen/generated/bindings.cc b/wasm/codegen/generated/bindings.cc
index 82c620df..00ffbcc2 100644
--- a/wasm/codegen/generated/bindings.cc
+++ b/wasm/codegen/generated/bindings.cc
@@ -2986,7 +2986,7 @@ struct MjsTexture {
     return emscripten::val(emscripten::typed_memory_view(2, ptr_->gridsize));
   }
   emscripten::val gridlayout() const {
-    return emscripten::val(emscripten::typed_memory_view(13, ptr_->gridlayout));
+    return emscripten::val(emscripten::typed_memory_view(12, ptr_->gridlayout));
   }
   mjStringVec &cubefiles() const {
     return *(ptr_->cubefiles);