diff --git a/fs/vfs.c b/fs/vfs.c
index 2140185..6fa0e83 100644
--- a/fs/vfs.c
+++ b/fs/vfs.c
@@ -4,6 +4,7 @@
 #include <fs/procfs.h>
 #include <mm/kmalloc.h>
 #include <lib/string.h>
+#include <lib/printf.h>
 #include <kernel/printk.h>
 
 #define MAX_OPEN_FILES 64
diff --git a/include/kernel/printk.h b/include/kernel/printk.h
index 2649351..3f107fd 100644
--- a/include/kernel/printk.h
+++ b/include/kernel/printk.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdarg.h>
+#include <lib/printf.h>
 
 // Linux-compatible log level prefixes
 #define KERN_EMERG   "\0010"  /* system is unusable */
diff --git a/include/lib/string.h b/include/lib/string.h
index 5e68d2c..029a51e 100644
--- a/include/lib/string.h
+++ b/include/lib/string.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include <lib/printf.h>
 
 // Memory functions
 void* memset(void* dest, int val, size_t count);