diff --git a/litex/soc/software/bios/sdram.c b/litex/soc/software/bios/sdram.c
index 52532aa46..fbd9afa8a 100644
--- a/litex/soc/software/bios/sdram.c
+++ b/litex/soc/software/bios/sdram.c
@@ -12,6 +12,11 @@
 
 #include "sdram.h"
 
+// FIXME(hack): If we don't have main ram, just target the sram instead.
+#ifndef MAIN_RAM_BASE
+#define MAIN_RAM_BASE SRAM_BASE
+#endif
+
 static void cdelay(int i)
 {
 	while(i > 0) {