diff --git a/nrf5/boards/nrf51822_ac.ld b/nrf5/boards/nrf51822_ac.ld
index 51fd503b58..2c591cd2f2 100644
--- a/nrf5/boards/nrf51822_ac.ld
+++ b/nrf5/boards/nrf51822_ac.ld
@@ -14,7 +14,7 @@ MEMORY
  
 /* produce a link error if there is not this amount of RAM for these sections */
 _minimum_stack_size = 2K;
-_minimum_heap_size = 10K;
+_minimum_heap_size = 20K;
  
 /* top end of the stack */
 
@@ -23,6 +23,6 @@ _estack = ORIGIN(RAM) + LENGTH(RAM);
 
 /* RAM extents for the garbage collector */
 _ram_end = ORIGIN(RAM) + LENGTH(RAM);
-_heap_end = 0x20001000; /* tunable */
+_heap_end = 0x20005000; /* tunable */
 
 INCLUDE "boards/common.ld"