diff --git a/src/system/boot/platform/bios_ia32/mmu.cpp b/src/system/boot/platform/bios_ia32/mmu.cpp
index 23ff09ac17..1f0fb21791 100644
--- a/src/system/boot/platform/bios_ia32/mmu.cpp
+++ b/src/system/boot/platform/bios_ia32/mmu.cpp
@@ -725,7 +725,7 @@ mmu_init(void)
 		gKernelArgs.physical_memory_range[0].start = 0;
 		gKernelArgs.physical_memory_range[0].size = 0x9f000;
 		gKernelArgs.physical_memory_range[1].start = 0x100000;
-		gKernelArgs.physical_memory_range[1].size = memSize;
+		gKernelArgs.physical_memory_range[1].size = memSize - 0x100000;
 		gKernelArgs.num_physical_memory_ranges = 2;
 	}