diff --git a/source/blender/blenkernel/intern/workspace.cc b/source/blender/blenkernel/intern/workspace.cc
index 813919bfd30..b0524f9b5d4 100644
--- a/source/blender/blenkernel/intern/workspace.cc
+++ b/source/blender/blenkernel/intern/workspace.cc
@@ -526,7 +526,7 @@ void BKE_workspace_tool_id_replace_table(struct WorkSpace *workspace,
                                          int replace_table_num)
 {
   const size_t idname_prefix_len = idname_prefix_skip ? strlen(idname_prefix_skip) : 0;
-  const size_t idname_suffix_len = sizeof(((bToolRef *)nullptr)->idname) - idname_prefix_len;
+  const size_t idname_suffix_len = sizeof(bToolRef::idname) - idname_prefix_len;
 
   LISTBASE_FOREACH (bToolRef *, tref, &workspace->tools) {
     if (!(tref->space_type == space_type && tref->mode == mode)) {
diff --git a/source/blender/editors/render/render_shading.cc b/source/blender/editors/render/render_shading.cc
index 2c7ca3f13bc..9022d5d80c1 100644
--- a/source/blender/editors/render/render_shading.cc
+++ b/source/blender/editors/render/render_shading.cc
@@ -1169,7 +1169,7 @@ void SCENE_OT_view_layer_add_lightgroup(wmOperatorType *ot)
   ot->prop = RNA_def_string(ot->srna,
                             "name",
                             nullptr,
-                            sizeof(((ViewLayerLightgroup *)nullptr)->name),
+                            sizeof(ViewLayerLightgroup::name),
                             "Name",
                             "Name of newly created lightgroup");
 }
diff --git a/source/blender/editors/space_outliner/outliner_draw.cc b/source/blender/editors/space_outliner/outliner_draw.cc
index 37001b067c2..f1e2e376fbe 100644
--- a/source/blender/editors/space_outliner/outliner_draw.cc
+++ b/source/blender/editors/space_outliner/outliner_draw.cc
@@ -2076,13 +2076,13 @@ static void outliner_buttons(const bContext *C,
   /* If we add support to rename Sequence, need change this. */
 
   if (tselem->type == TSE_EBONE) {
-    len = sizeof(((EditBone *)nullptr)->name);
+    len = sizeof(EditBone::name);
   }
   else if (tselem->type == TSE_MODIFIER) {
-    len = sizeof(((ModifierData *)nullptr)->name);
+    len = sizeof(ModifierData::name);
   }
   else if (tselem->id && GS(tselem->id->name) == ID_LI) {
-    len = sizeof(((Library *)nullptr)->filepath);
+    len = sizeof(Library::filepath);
   }
   else {
     len = MAX_ID_NAME - 2;
diff --git a/source/blender/editors/space_outliner/outliner_tree.cc b/source/blender/editors/space_outliner/outliner_tree.cc
index 06a2fa8aa25..c98fdfdfe92 100644
--- a/source/blender/editors/space_outliner/outliner_tree.cc
+++ b/source/blender/editors/space_outliner/outliner_tree.cc
@@ -1634,7 +1634,7 @@ static void outliner_filter_tree(SpaceOutliner *space_outliner,
                                  const Scene *scene,
                                  ViewLayer *view_layer)
 {
-  char search_buff[sizeof(((struct SpaceOutliner *)nullptr)->search_string) + 2];
+  char search_buff[sizeof(SpaceOutliner::search_string) + 2];
   char *search_string;
 
   const int exclude_filter = outliner_exclude_filter_get(space_outliner);
diff --git a/source/blender/imbuf/intern/openexr/openexr_api.cpp b/source/blender/imbuf/intern/openexr/openexr_api.cpp
index 7e8eaca0e9d..82982f9d38c 100644
--- a/source/blender/imbuf/intern/openexr/openexr_api.cpp
+++ b/source/blender/imbuf/intern/openexr/openexr_api.cpp
@@ -824,7 +824,7 @@ static void imb_exr_insert_view_name(char *name_full, const char *passname, cons
   BLI_assert(!ELEM(name_full, passname, viewname));
 
   if (viewname == nullptr || viewname[0] == '\0') {
-    BLI_strncpy(name_full, passname, sizeof(((ExrChannel *)nullptr)->name));
+    BLI_strncpy(name_full, passname, sizeof(ExrChannel::name));
     return;
   }
 
diff --git a/source/blender/io/collada/ArmatureImporter.cpp b/source/blender/io/collada/ArmatureImporter.cpp
index 5402d08d075..2bfd67c4095 100644
--- a/source/blender/io/collada/ArmatureImporter.cpp
+++ b/source/blender/io/collada/ArmatureImporter.cpp
@@ -1012,7 +1012,7 @@ void ArmatureImporter::get_rna_path_for_joint(COLLADAFW::Node *node,
                                               char *joint_path,
                                               size_t count)
 {
-  char bone_name_esc[sizeof(((Bone *)nullptr)->name) * 2];
+  char bone_name_esc[sizeof(Bone::name) * 2];
   BLI_str_escape(bone_name_esc, bc_get_joint_name(node), sizeof(bone_name_esc));
   BLI_snprintf(joint_path, count, "pose.bones[\"%s\"]", bone_name_esc);
 }
diff --git a/source/blender/io/collada/collada_utils.cpp b/source/blender/io/collada/collada_utils.cpp
index 6a65b27a93d..1e83c8be72a 100644
--- a/source/blender/io/collada/collada_utils.cpp
+++ b/source/blender/io/collada/collada_utils.cpp
@@ -769,7 +769,7 @@ void bc_enable_fcurves(bAction *act, char *bone_name)
   char prefix[200];
 
   if (bone_name) {
-    char bone_name_esc[sizeof(((Bone *)nullptr)->name) * 2];
+    char bone_name_esc[sizeof(Bone::name) * 2];
     BLI_str_escape(bone_name_esc, bone_name, sizeof(bone_name_esc));
     BLI_snprintf(prefix, sizeof(prefix), "pose.bones[\"%s\"]", bone_name_esc);
   }