diff --git a/Kernel/API/POSIX/sys/types.h b/Kernel/API/POSIX/sys/types.h
index 3029e0a101..2ff467b9c0 100644
--- a/Kernel/API/POSIX/sys/types.h
+++ b/Kernel/API/POSIX/sys/types.h
@@ -92,9 +92,9 @@ typedef struct __pthread_condattr_t {
     int clockid; // clockid_t
 } pthread_condattr_t;
 
-inline dev_t makedev(unsigned major, unsigned minor) { return (minor & 0xffu) | (major << 8u) | ((minor & ~0xffu) << 12u); }
-inline unsigned int major(dev_t dev) { return (dev & 0xfff00u) >> 8u; }
-inline unsigned int minor(dev_t dev) { return (dev & 0xffu) | ((dev >> 12u) & 0xfff00u); }
+static inline dev_t makedev(unsigned major, unsigned minor) { return (minor & 0xffu) | (major << 8u) | ((minor & ~0xffu) << 12u); }
+static inline unsigned int major(dev_t dev) { return (dev & 0xfff00u) >> 8u; }
+static inline unsigned int minor(dev_t dev) { return (dev & 0xffu) | ((dev >> 12u) & 0xfff00u); }
 
 #ifdef __cplusplus
 }