diff --git a/ChangeLog b/ChangeLog
index a0a8f04..072584b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2017-08-11  NIIBE Yutaka  <gniibe@fsij.org>
 
+	* src/gnuk.ld.in (__process3_stack_size__): Tweak the size.
+
 	* src/configure: Define STM32F103_OVERRIDE_FLASH_SIZE_KB for
 	BULE_PILL.
 
diff --git a/src/gnuk.ld.in b/src/gnuk.ld.in
index cb65772..7995a88 100644
--- a/src/gnuk.ld.in
+++ b/src/gnuk.ld.in
@@ -5,7 +5,7 @@ __main_stack_size__      = 0x0080;      /* Exception handlers     */
 __process0_stack_size__  = 0x0100;      /* main */
 __process1_stack_size__  = 0x01a0;      /* ccid */
 __process2_stack_size__  = 0x0180;      /* rng */
-__process3_stack_size__  = 0x1640;      /* gpg */
+__process3_stack_size__  = 0x1660;      /* gpg */
 __process4_stack_size__  = 0;           /* --- */
 __process5_stack_size__  = @MSC_SIZE@;  /* msc */
 __process6_stack_size__  = @TIM_SIZE@;  /* intr: timer */