diff --git a/stm32-flash.ld b/stm32-flash.ld
--- a/stm32-flash.ld
+++ b/stm32-flash.ld
@@ -33,7 +33,7 @@
 ENTRY(Reset_Handler)
 
 /* Highest address of the user mode stack */
-_estack = 0x20004000;    /* end of 16K RAM */
+_estack = 0x20001000;    /* end of 4K RAM */
 
 /* Generate a link error if heap and stack don't fit into RAM */
 _Min_Heap_Size = 0x200;      /* required amount of heap  */
@@ -42,8 +42,8 @@ ENTRY(Reset_Handler)
 /* Specify the memory areas */
 MEMORY
 {
-  FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 256K
-  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 16K
+  FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 32K
+  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 4K
   MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
 }