diff --git a/config/libc/eglibc.in b/config/libc/eglibc.in
index f37ff89c..0dc6848f 100644
--- a/config/libc/eglibc.in
+++ b/config/libc/eglibc.in
@@ -95,6 +95,13 @@ config EGLIBC_CHECKOUT
       Note that crosstool-NG will *not* update your working copy, you will
       have to do that yourself.
 
+config EGLIBC_OPT_SIZE
+    bool
+    prompt "optimize eglibc for size (-Os)"
+    help
+      Optimize eglibc for size using -Os instead of -O2. This will make eglibc
+      smaller but may make it slower.
+
 config EGLIBC_CUSTOM_CONFIG
     bool
     prompt "Use custom configuration file"
diff --git a/scripts/build/libc/eglibc.sh b/scripts/build/libc/eglibc.sh
index b36201c8..1875a238 100644
--- a/scripts/build/libc/eglibc.sh
+++ b/scripts/build/libc/eglibc.sh
@@ -259,6 +259,12 @@ do_libc() {
         CT_DoExecLog ALL cp "${CT_CONFIG_DIR}/eglibc.config" option-groups.config
     fi
 
+    if [ "${CT_EGLIBC_OPT_SIZE}" = "y" ]; then
+        OPTIMIZE=-Os
+    else
+        OPTIMIZE=-O2
+    fi
+
     # Add some default glibc config options if not given by user.
     # We don't need to be conditional on wether the user did set different
     # values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config
@@ -301,7 +307,7 @@ do_libc() {
     CT_DoLog DEBUG "Extra CC args passed    : '${extra_cc_args}'"
 
     BUILD_CC="${CT_BUILD}-gcc"                                      \
-    CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O2"  \
+    CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} ${OPTIMIZE}"  \
     CC="${CT_TARGET}-gcc ${CT_LIBC_EXTRA_CC_ARGS} ${extra_cc_args}" \
     AR=${CT_TARGET}-ar                                              \
     RANLIB=${CT_TARGET}-ranlib                                      \