diff --git a/doc/example.conf.in b/doc/example.conf.in
index d38f90ea2..3c08d1242 100644
--- a/doc/example.conf.in
+++ b/doc/example.conf.in
@@ -481,7 +481,8 @@ activation {
     missing_stripe_filler = "error"
 
     # How much stack (in KB) to reserve for use while devices suspended
-    reserved_stack = 256
+    # Prior to version 2.02.89 this used to be set to 256KB
+    reserved_stack = 64
 
     # How much memory (in KB) to reserve for use while devices suspended
     reserved_memory = 8192
diff --git a/lib/config/defaults.h b/lib/config/defaults.h
index 16b524db9..0583fd2be 100644
--- a/lib/config/defaults.h
+++ b/lib/config/defaults.h
@@ -116,7 +116,7 @@
 #ifdef DEVMAPPER_SUPPORT
 #  define DEFAULT_ACTIVATION 1
 #  define DEFAULT_RESERVED_MEMORY 8192
-#  define DEFAULT_RESERVED_STACK 256
+#  define DEFAULT_RESERVED_STACK 64 /* KB */
 #  define DEFAULT_PROCESS_PRIORITY -18
 #else
 #  define DEFAULT_ACTIVATION 0