diff --git a/arch/sandbox/cpu/state.c b/arch/sandbox/cpu/state.c
index a681e47..dd7978c 100644
--- a/arch/sandbox/cpu/state.c
+++ b/arch/sandbox/cpu/state.c
@@ -448,7 +448,7 @@
 {
 	state = &main_state;
 
-	state->ram_size = CONFIG_SYS_SDRAM_SIZE;
+	state->ram_size = CFG_SYS_SDRAM_SIZE;
 	state->ram_buf = os_malloc(state->ram_size);
 	if (!state->ram_buf) {
 		printf("Out of memory\n");