diff --git a/Kernel/FileSystem/VirtualFileSystem.h b/Kernel/FileSystem/VirtualFileSystem.h
index 1969327698..f3f2ddad76 100644
--- a/Kernel/FileSystem/VirtualFileSystem.h
+++ b/Kernel/FileSystem/VirtualFileSystem.h
@@ -43,7 +43,7 @@ namespace Kernel {
 class Custody;
 class Device;
 class FileDescription;
-class UnveiledPath;
+struct UnveiledPath;
 
 struct UidAndGid {
     uid_t uid;
diff --git a/Kernel/Thread.h b/Kernel/Thread.h
index f6c1a189fd..f8f9d1ded0 100644
--- a/Kernel/Thread.h
+++ b/Kernel/Thread.h
@@ -530,7 +530,7 @@ private:
     IntrusiveListNode m_wait_queue_node;
 
 private:
-    friend class SchedulerData;
+    friend struct SchedulerData;
     friend class WaitQueue;
     bool unlock_process_if_locked();
     void relock_process(bool did_unlock);
diff --git a/Kernel/VM/MappedROM.h b/Kernel/VM/MappedROM.h
index 9be57c2f45..26caff10d8 100644
--- a/Kernel/VM/MappedROM.h
+++ b/Kernel/VM/MappedROM.h
@@ -31,7 +31,8 @@
 
 namespace Kernel {
 
-struct MappedROM {
+class MappedROM {
+public:
     const u8* base() const { return region->vaddr().offset(offset).as_ptr(); }
     const u8* end() const { return base() + size; }
     OwnPtr<Region> region;
diff --git a/Libraries/LibDebug/Dwarf/Expression.h b/Libraries/LibDebug/Dwarf/Expression.h
index fedc636c83..ef13830353 100644
--- a/Libraries/LibDebug/Dwarf/Expression.h
+++ b/Libraries/LibDebug/Dwarf/Expression.h
@@ -29,7 +29,7 @@
 #include "AK/ByteBuffer.h"
 #include "AK/Types.h"
 
-class PtraceRegisters;
+struct PtraceRegisters;
 
 namespace Debug::Dwarf::Expression {