diff --git a/headers/os/kernel/OS.h b/headers/os/kernel/OS.h
index af4c46b045..edad40461f 100644
--- a/headers/os/kernel/OS.h
+++ b/headers/os/kernel/OS.h
@@ -473,7 +473,7 @@ typedef union {
 		uint32	reserved_2;
 	} eax_1;
 
-struct {
+	struct {
 		uint8	call_num;
 		uint8	cache_descriptors[15];
 	} eax_2;