diff --git a/UNITTESTS/platform/ATCmdParser/test_ATCmdParser.cpp b/UNITTESTS/platform/ATCmdParser/test_ATCmdParser.cpp
index bd219c5a07..d08c1ef079 100644
--- a/UNITTESTS/platform/ATCmdParser/test_ATCmdParser.cpp
+++ b/UNITTESTS/platform/ATCmdParser/test_ATCmdParser.cpp
@@ -189,8 +189,8 @@ TEST_F(test_ATCmdParser, test_ATCmdParser_read)
     filehandle_stub_table_pos = 0;
 
     ATCmdParser at(&fh1, ",");
-    char buf[6];
-    memset(buf, 0, 6);
+    char buf[8];
+    memset(buf, 0, 8);
 
     // TEST EMPTY BUFFER
     // Shouldn't read any byte since buffer is empty