diff --git a/cmake/StringUtility.cmake b/cmake/StringUtility.cmake
index 3e8b4614..00c5ba5c 100644
--- a/cmake/StringUtility.cmake
+++ b/cmake/StringUtility.cmake
@@ -4,7 +4,7 @@ function(string_left_pad VAR INPUT LENGTH FILLCHAR)
     set(_output "${INPUT}")
     string(LENGTH "${_output}" _length)
     while(_length LESS "${LENGTH}")
-        string(PREPEND _output "${FILLCHAR}")
+        set(_output "${FILLCHAR}${_output}")
         string(LENGTH "${_output}" _length)
     endwhile()
     set("${VAR}" "${_output}" PARENT_SCOPE)