diff --git a/README.md b/README.md
index 6448c487e..da399b8d5 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,10 @@ The autogenerated OSAL user's guide can be viewed at <https://github.com/nasa/cF
 
 ## Version History
 
+### Development Build: v5.1.0-rc1+dev573
+
+- Add independent OS_rename functional test parameter checks
+- See <https://github.com/nasa/osal/issues/1113> and <https://github.com/nasa/cfs/pull/311>
 
 ### Development Build: v5.1.0-rc1+dev569
 
diff --git a/src/os/inc/osapi-version.h b/src/os/inc/osapi-version.h
index e118b2b99..d36faaa2c 100644
--- a/src/os/inc/osapi-version.h
+++ b/src/os/inc/osapi-version.h
@@ -36,7 +36,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER   569
+#define OS_BUILD_NUMBER   573
 #define OS_BUILD_BASELINE "v5.1.0-rc1"
 
 /*
diff --git a/src/unit-tests/osfile-test/ut_osfile_fileio_test.c b/src/unit-tests/osfile-test/ut_osfile_fileio_test.c
index 0e54b6729..078cec401 100644
--- a/src/unit-tests/osfile-test/ut_osfile_fileio_test.c
+++ b/src/unit-tests/osfile-test/ut_osfile_fileio_test.c
@@ -1093,23 +1093,26 @@ void UT_os_renamefile_test()
     /*-----------------------------------------------------*/
     /* #2 Invalid-path-arg */
 
-    UT_RETVAL(OS_rename(g_invalidPath, g_invalidPath), OS_FS_ERR_PATH_INVALID);
+    UT_RETVAL(OS_rename(g_invalidPath, g_fNames[1]), OS_FS_ERR_PATH_INVALID);
+    UT_RETVAL(OS_rename(g_fNames[0], g_invalidPath), OS_FS_ERR_PATH_INVALID);
 
     /*-----------------------------------------------------*/
     /* #3 Path-too-long-arg */
 
-    UT_RETVAL(OS_rename(g_longPathName, g_longPathName), OS_FS_ERR_PATH_TOO_LONG);
+    UT_RETVAL(OS_rename(g_longPathName, g_fNames[1]), OS_FS_ERR_PATH_TOO_LONG);
+    UT_RETVAL(OS_rename(g_fNames[0], g_longPathName), OS_FS_ERR_PATH_TOO_LONG);
 
     /*-----------------------------------------------------*/
     /* #4 Name-too-long-arg */
 
-    UT_RETVAL(OS_rename(g_longFileName, g_longFileName), OS_FS_ERR_NAME_TOO_LONG);
+    UT_RETVAL(OS_rename(g_longFileName, g_fNames[1]), OS_FS_ERR_NAME_TOO_LONG);
+    UT_RETVAL(OS_rename(g_fNames[0], g_longFileName), OS_FS_ERR_NAME_TOO_LONG);
 
     /*-----------------------------------------------------*/
     /* #6 Nominal */
 
     memset(g_fNames[0], '\0', sizeof(g_fNames[0]));
-    memset(g_fNames[0], '\0', sizeof(g_fNames[1]));
+    memset(g_fNames[1], '\0', sizeof(g_fNames[1]));
     UT_os_sprintf(g_fNames[0], "%s/Rename_Nom_Old.txt", g_mntName);
     UT_os_sprintf(g_fNames[1], "%s/Rename_Nom_New.txt", g_mntName);