diff --git a/CMakeLists.txt b/CMakeLists.txt
index b1404ad22b..4d19eb626b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,7 @@ endif()
 set(CMAKE_SYSTEM_SUB_PROCESSOR ${CMAKE_SYSTEM_PROCESSOR})
 
 if(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "i686" OR
-    ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64") 
+    ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
   set(CMAKE_SYSTEM_PROCESSOR "x86")
 endif()
 
@@ -100,7 +100,7 @@ if(NOT DEFINED PREFER_SIZE_OVER_SPEED)
   else()
     set(default_prefer_size 0)
   endif()
-  option(PREFER_SIZE_OVER_SPEED ${default_prefer_size})
+  option(PREFER_SIZE_OVER_SPEED 0)
 endif()
 
 # Obsoleted. Reentrant syscalls provided for us
diff --git a/meson.build b/meson.build
index c49856ee0f..679ff57141 100644
--- a/meson.build
+++ b/meson.build
@@ -154,7 +154,7 @@ if set_double_equals_float
   float_double_code = '''
 char size_test[sizeof(float) == sizeof(double) ? 1 : -1];
 '''
-  set_double_equals_float = 
+  set_double_equals_float =
   double_equals_float = cc.compiles(float_double_code, name : 'double same as float', args : core_c_args)
 endif
 
@@ -502,7 +502,7 @@ else
   specs_install = true
 endif
 
-# Let targets add more support libraries 
+# Let targets add more support libraries
 additional_libs_list = meson.get_cross_property('additional_libs', [])
 
 if cc.get_id() == 'ccomp'
@@ -647,7 +647,7 @@ if enable_multilib
   gen_multilib_crt0_path = specs_prefix_format.format(get_option('libdir') / '%M' / crt0_expr)
   crt0_gen = gen_format.format(gen_multilib_crt0_path)
 endif
-  
+
 #
 # Construct the *startfile value from the options computed
 # above. As there's only one value, it's either the
@@ -1032,7 +1032,7 @@ conf_data.set('_RETARGETABLE_LOCKING', get_option('newlib-retargetable-locking')
 conf_data.set('TINY_STDIO', tinystdio, description: 'Use tiny stdio from gcc avr')
 conf_data.set('_IEEE_LIBM', not get_option('want-math-errno'), description: 'math library does not set errno (offering only ieee semantics)')
 conf_data.set('_WANT_MATH_ERRNO', get_option('want-math-errno'), description: 'math library sets errno')
-conf_data.set('PREFER_SIZE_OVER_SPEED', get_option('optimization') == 's', description: 'Optimize for space over speed')
+# conf_data.set('PREFER_SIZE_OVER_SPEED', get_option('optimization') == 's', description: 'Optimize for space over speed')
 conf_data.set('FAST_STRCMP', fast_strcmp, description: 'Always optimize strcmp for performance')
 conf_data.set('__HAVE_LOCALE_INFO__', newlib_locale_info, description: 'locale support')
 conf_data.set('__HAVE_LOCALE_INFO_EXTENDED__', get_option('newlib-locale-info-extended'), description: 'extended locale support')
diff --git a/zephyr/zephyr.cmake b/zephyr/zephyr.cmake
index cb1daca4f6..f6ecd6692f 100644
--- a/zephyr/zephyr.cmake
+++ b/zephyr/zephyr.cmake
@@ -72,7 +72,7 @@ if(CONFIG_PICOLIBC_USE_MODULE)
   picolibc_option_false("__SINGLE_THREAD__" CONFIG_PICOLIBC_MULTITHREAD)
   picolibc_option_true("PICOLIBC_TLS" CONFIG_THREAD_LOCAL_STORAGE)
   picolibc_option_true("NEWLIB_GLOBAL_ERRNO" CONFIG_PICOLIBC_GLOBAL_ERRNO)
-  picolibc_option_true(PREFER_SIZE_OVER_SPEED CONFIG_SIZE_OPTIMIZATIONS)
+#   picolibc_option_true(PREFER_SIZE_OVER_SPEED CONFIG_SIZE_OPTIMIZATIONS)
 
   if(NOT DEFINED CONFIG_THREAD_LOCAL_STORAGE)
     set(__PICOLIBC_ERRNO_FUNCTION z_errno_wrap)