diff --git a/CMakeLists.txt b/CMakeLists.txt
index a3ed2a312..715679957 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -234,22 +234,18 @@ if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
   if ("${TARGET_ARCHITECTURE}" STREQUAL "x86_64")
     list(APPEND Z3_COMPONENT_CXX_DEFINES "-D_USE_THREAD_LOCAL")
   endif()
-  z3_add_cxx_flag("-fno-strict-aliasing" REQUIRED)
 elseif ("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
   # Does OSX really not need any special flags?
   message(STATUS "Platform: Darwin")
 elseif ("${CMAKE_SYSTEM_NAME}" MATCHES "FreeBSD")
   message(STATUS "Platform: FreeBSD")
   list(APPEND Z3_COMPONENT_CXX_DEFINES "-D_FREEBSD_")
-  z3_add_cxx_flag("-fno-strict-aliasing" REQUIRED)
 elseif ("${CMAKE_SYSTEM_NAME}" MATCHES "OpenBSD")
   message(STATUS "Platform: OpenBSD")
   list(APPEND Z3_COMPONENT_CXX_DEFINES "-D_OPENBSD_")
-  z3_add_cxx_flag("-fno-strict-aliasing" REQUIRED)
 elseif (CYGWIN)
   message(STATUS "Platform: Cygwin")
   list(APPEND Z3_COMPONENT_CXX_DEFINES "-D_CYGWIN")
-  z3_add_cxx_flag("-fno-strict-aliasing" REQUIRED)
 elseif (WIN32)
   message(STATUS "Platform: Windows")
   list(APPEND Z3_COMPONENT_CXX_DEFINES "-D_WINDOWS")
diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index d2e3d6b4c..24f22d8ee 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -2443,26 +2443,26 @@ def mk_config():
             SO_EXT         = '.dylib'
             SLIBFLAGS      = '-dynamiclib'
         elif sysname == 'Linux':
-            CXXFLAGS       = '%s -fno-strict-aliasing -D_LINUX_' % CXXFLAGS
+            CXXFLAGS       = '%s -D_LINUX_' % CXXFLAGS
             OS_DEFINES     = '-D_LINUX_'
             SO_EXT         = '.so'
             LDFLAGS        = '%s -lrt' % LDFLAGS
             SLIBFLAGS      = '-shared'
             SLIBEXTRAFLAGS = '%s -lrt' % SLIBEXTRAFLAGS
         elif sysname == 'FreeBSD':
-            CXXFLAGS       = '%s -fno-strict-aliasing -D_FREEBSD_' % CXXFLAGS
+            CXXFLAGS       = '%s -D_FREEBSD_' % CXXFLAGS
             OS_DEFINES     = '-D_FREEBSD_'
             SO_EXT         = '.so'
             LDFLAGS        = '%s -lrt' % LDFLAGS
             SLIBFLAGS      = '-shared'
             SLIBEXTRAFLAGS = '%s -lrt' % SLIBEXTRAFLAGS
         elif sysname == 'OpenBSD':
-            CXXFLAGS       = '%s -fno-strict-aliasing -D_OPENBSD_' % CXXFLAGS
+            CXXFLAGS       = '%s -D_OPENBSD_' % CXXFLAGS
             OS_DEFINES     = '-D_OPENBSD_'
             SO_EXT         = '.so'
             SLIBFLAGS      = '-shared'
         elif sysname[:6] ==  'CYGWIN':
-            CXXFLAGS    = '%s -D_CYGWIN -fno-strict-aliasing' % CXXFLAGS
+            CXXFLAGS    = '%s -D_CYGWIN' % CXXFLAGS
             OS_DEFINES     = '-D_CYGWIN'
             SO_EXT      = '.dll'
             SLIBFLAGS   = '-shared'