diff --git a/flang/CMakeLists.txt b/flang/CMakeLists.txt
index 56a96f590f0a..068d134671db 100644
--- a/flang/CMakeLists.txt
+++ b/flang/CMakeLists.txt
@@ -421,7 +421,7 @@ endif()
 if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
 
   if (NOT "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-aliasing -fno-semantic-interposition")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-semantic-interposition")
   else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-command-line-argument -Wstring-conversion \
           -Wcovered-switch-default")