diff --git a/arch/x86/cpu/coreboot/sdram.c b/arch/x86/cpu/coreboot/sdram.c
index 013225f129a..cc1edd7badd 100644
--- a/arch/x86/cpu/coreboot/sdram.c
+++ b/arch/x86/cpu/coreboot/sdram.c
@@ -42,6 +42,8 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
 			continue;
 
 		/* Filter memory over 4GB. */
+		if (start > 0xffffffffULL)
+			continue;
 		if (end > 0xffffffffULL)
 			end = 0x100000000ULL;
 		/* Skip this region if it's too small. */