diff --git a/reactos/include/reactos/version.cmake b/reactos/include/reactos/version.cmake
index f82bd5c3d84..57b156d7573 100644
--- a/reactos/include/reactos/version.cmake
+++ b/reactos/include/reactos/version.cmake
@@ -17,6 +17,7 @@ macro(inttohex INTVALUE OUTPUT_VARIABLE)
 endmacro()
 
 macro(converttohex INTVALUE OUTPUT_VARIABLE)
+    set(${OUTPUT_VARIABLE} "")
     set(REMAINING ${INTVALUE})
     while(REMAINING)
         math(EXPR REMAINDER "${REMAINING}%16")