diff --git a/c_os/kernel/Paging.cc b/c_os/kernel/Paging.cc
index fdbd319..a998377 100644
--- a/c_os/kernel/Paging.cc
+++ b/c_os/kernel/Paging.cc
@@ -107,6 +107,8 @@ void pg_write_protect_page(const unsigned int* p_page) {
 
     unsigned int mask = PAGE_WRITEABLE;  // fill to 32bit
     *page = *page & ~mask;               // set writable to 0
+
+    invalidate_tlb_entry(p_page);
 }
 
 /*****************************************************************************
@@ -122,6 +124,8 @@ void pg_notpresent_page(const unsigned int* p_page) {
 
     unsigned int mask = PAGE_PRESENT;
     *page = *page & ~mask;  // set present to 0
+
+    invalidate_tlb_entry(p_page);
 }
 
 /*****************************************************************************
@@ -206,4 +210,4 @@ void pg_init() {
 
     // Paging aktivieren (in startup.asm)
     paging_on(reinterpret_cast<unsigned int*>(PAGE_DIRECTORY));
-}
+}
\ No newline at end of file
diff --git a/c_os/kernel/Paging.h b/c_os/kernel/Paging.h
index 826a4c3..335e908 100644
--- a/c_os/kernel/Paging.h
+++ b/c_os/kernel/Paging.h
@@ -55,7 +55,7 @@
 // Externe Funktionen in startup.asm
 extern "C" {
     void paging_on(unsigned int* p_pdir);          // Paging einschalten
-    void invalidate_tlb_entry(unsigned int* ptr);  // Page in TLB invalid.
+    void invalidate_tlb_entry(const unsigned int* ptr);  // Page in TLB invalid.
 }
 
 // ativiert paging