diff --git a/kernel/memory.c b/kernel/memory.c
index 389f5e1..137d8a7 100644
--- a/kernel/memory.c
+++ b/kernel/memory.c
@@ -1,5 +1,5 @@
-#ifndef LINKED_LIST_C
-#define LINKED_LIST_C
+#ifndef MEMORY_C
+#define MEMORY_C
 
 
 #include <stddef.h>
@@ -26,7 +26,7 @@ typedef struct page_tag {
 page_tag *start = (void *) MEMORY_START;;
 
 size_t calculate_realsize(size_t size) {
-    if (size % PAGE_ALIGNMENT == 0) return size + 0;
+    if (size % PAGE_ALIGNMENT == 0) return size;
     return size + PAGE_ALIGNMENT - (size % PAGE_ALIGNMENT);
 }
 
@@ -205,4 +205,4 @@ int command_mem_dump(char *string) {
 //    test_allocs();
 //}
 
-#endif // LINKED_LIST_C
+#endif // MEMORY_C
diff --git a/kernel/tests/tests.c b/kernel/tests/tests.c
index 1ccef94..f6da202 100644
--- a/kernel/tests/tests.c
+++ b/kernel/tests/tests.c
@@ -1,5 +1,5 @@
-#ifndef TESTS_C
-#define TESTS_C
+#ifndef TESTS_TESTS_C
+#define TESTS_TESTS_C
 
 #define TESTS_ENABLED
 #ifdef TESTS_ENABLED
@@ -88,4 +88,4 @@ static char *all_tests() {
 
 #endif // TESTS_ENABLED
 
-#endif // TESTS_C
\ No newline at end of file
+#endif // TESTS_TESTS_C
\ No newline at end of file
diff --git a/kernel/util/printer.c b/kernel/util/printer.c
index 4237d3e..98dea8e 100644
--- a/kernel/util/printer.c
+++ b/kernel/util/printer.c
@@ -1,5 +1,5 @@
-#ifndef TABS_PRINTER_C
-#define TABS_PRINTER_C
+#ifndef UTIL_PRINTER_C
+#define UTIL_PRINTER_C
 
 #include <stdarg.h>
 
@@ -69,4 +69,4 @@ void print(const char *fmt, ...) {
     va_end(argp);
 }
 
-#endif //TABS_PRINTER_C
\ No newline at end of file
+#endif //UTIL_PRINTER_C
\ No newline at end of file