diff --git a/library/common.h b/library/common.h
index c31ac1e1c..0f61f9452 100644
--- a/library/common.h
+++ b/library/common.h
@@ -50,7 +50,7 @@
 #define MBEDTLS_STATIC_TESTABLE static
 #endif
 
-/** Allow library to access it's structs' private members.
+/** Allow library to access its structs' private members.
  *
  * Although structs defined in header files are publicly available,
  * their members are private and should not be accessed by the user.