diff --git a/configs/sam3u-ek/ostest/defconfig b/configs/sam3u-ek/ostest/defconfig
index ba35aa8af0..d7d593a8b4 100755
--- a/configs/sam3u-ek/ostest/defconfig
+++ b/configs/sam3u-ek/ostest/defconfig
@@ -77,7 +77,7 @@ CONFIG_ARCH_CHIP_AT91SAM3U4=y
 CONFIG_ARCH_BOARD=sam3u-ek
 CONFIG_ARCH_BOARD_SAM3UEK=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
-CONFIG_DRAM_SIZE=0x00010000
+CONFIG_DRAM_SIZE=0x0000c000
 CONFIG_DRAM_START=0x20000000
 CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y