diff --git a/firmware/sections.lds b/firmware/sections.lds
index 3c56e9d..948814b 100644
--- a/firmware/sections.lds
+++ b/firmware/sections.lds
@@ -8,7 +8,9 @@ means.
 */
 
 MEMORY {
-	mem : ORIGIN = 0x00000000, LENGTH = 0x00010000
+	/* the memory in the testbench is 64k in size;
+	 * set LENGTH=48k and leave at least 16k for stack */
+	mem : ORIGIN = 0x00000000, LENGTH = 0x0000c000
 }
 
 SECTIONS {