diff --git a/reactos/CMakeLists.txt b/reactos/CMakeLists.txt
index 0f95bc75827..ac1831ba250 100644
--- a/reactos/CMakeLists.txt
+++ b/reactos/CMakeLists.txt
@@ -16,6 +16,11 @@ if(POLICY CMP0051)
     cmake_policy(SET CMP0051 NEW)
 endif()
 
+if(POLICY CMP0058)
+    # Ninja requires custom command byproducts to be explicit
+    cmake_policy(SET CMP0058 OLD)
+endif()
+
 project(REACTOS)
 
 # Versioning