diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 32c4085621..eb4e0841c2 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -603,7 +603,7 @@ else()
   endif()
   if(HAS_DEPRECATED_COPY)
     #too many such errors in eigen and gemmlowp
-    string(APPEND CMAKE_CXX_FLAGS_DEBUG " -Wno-deprecated-copy")
+    string(APPEND CMAKE_CXX_FLAGS " -Wno-deprecated-copy")
   endif()
   if(HAS_PARENTHESES)
     string(APPEND CMAKE_CXX_FLAGS " -Wno-parentheses")