diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fe3c8796..dc33a0ca9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+##Development Build: v6.0.0-rc4+dev243
+- Wrong memory alignment calculation
+- See <https://github.com/nasa/osal/pull/1413>
+
 ## Development Build: v6.0.0-rc4+dev239
 - Add RTEMS console and timebase posix task names
 - See <https://github.com/nasa/osal/pull/1422>
diff --git a/src/os/inc/osapi-version.h b/src/os/inc/osapi-version.h
index 5ab1c1bb3..95d2ab90c 100644
--- a/src/os/inc/osapi-version.h
+++ b/src/os/inc/osapi-version.h
@@ -34,7 +34,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER   239
+#define OS_BUILD_NUMBER   243
 #define OS_BUILD_BASELINE "v6.0.0-rc4"
 
 /*
diff --git a/src/unit-test-coverage/ut-stubs/src/libc-stdlib-stubs.c b/src/unit-test-coverage/ut-stubs/src/libc-stdlib-stubs.c
index 9b22b7188..8e042dcae 100644
--- a/src/unit-test-coverage/ut-stubs/src/libc-stdlib-stubs.c
+++ b/src/unit-test-coverage/ut-stubs/src/libc-stdlib-stubs.c
@@ -150,7 +150,7 @@ void *OCS_malloc(size_t sz)
         return NULL;
     }
 
-    NextSize  = (NextSize + MPOOL_ALIGN - 1) & ~((size_t)MPOOL_ALIGN);
+    NextSize  = (NextSize + MPOOL_ALIGN - 1) & ~((size_t)MPOOL_ALIGN - 1);
     NextBlock = Rec->BlockAddr + MPOOL_ALIGN;
     Rec->BlockAddr += NextSize;
     Rec->Size += NextSize;