diff --git a/config/libc/newlib.in.2 b/config/libc/newlib.in.2
index 911c864f..66b02759 100644
--- a/config/libc/newlib.in.2
+++ b/config/libc/newlib.in.2
@@ -1,5 +1,12 @@
 # newlib second-part options
 
+config LIBC_NEWLIB_IO_LL
+    bool
+    prompt "Enable IOs on long long"
+    default n
+    help
+      Enable support for IOs on long long integers.
+
 config LIBC_NEWLIB_IO_FLOAT
     bool
     prompt "Enable IOs on floats and doubles"
diff --git a/scripts/build/libc/newlib.sh b/scripts/build/libc/newlib.sh
index b073a757..65a666ec 100644
--- a/scripts/build/libc/newlib.sh
+++ b/scripts/build/libc/newlib.sh
@@ -68,6 +68,11 @@ do_libc_start_files() {
 
     CT_DoLog EXTRA "Configuring C library"
 
+    if [ "${CT_LIBC_NEWLIB_IO_LL}" = "y" ]; then
+        newlib_opts+=( "--enable-newlib-io-long-long" )
+    else
+        newlib_opts+=( "--disable-newlib-io-long-long" )
+    fi
     if [ "${CT_LIBC_NEWLIB_IO_FLOAT}" = "y" ]; then
         newlib_opts+=( "--enable-newlib-io-float" )
         if [ "${CT_LIBC_NEWLIB_IO_LDBL}" = "y" ]; then