diff --git a/src/ints/ems.cpp b/src/ints/ems.cpp
index 81ce3b27..7cabca45 100644
--- a/src/ints/ems.cpp
+++ b/src/ints/ems.cpp
@@ -33,7 +33,7 @@
 #define EMM_PAGEFRAME	0xE000
 #define EMM_PAGEFRAME4K	((EMM_PAGEFRAME*16)/4096)
 #define	EMM_MAX_HANDLES	50				/* 255 Max */
-#define EMM_PAGE_SIZE	(16*1024)
+#define EMM_PAGE_SIZE	(16*1024U)
 #define EMM_MAX_PAGES	(32 * 1024 / 16 )
 #define EMM_MAX_PHYS	4				/* 4 16kb pages in pageframe */
 
@@ -356,7 +356,7 @@ static Bit8u MemoryRegion(void) {
 		src_mem=region.src_page_seg*16+region.src_offset;
 	} else {
 		if (!ValidHandle(region.src_handle)) return EMM_INVALID_HANDLE;
-		if (emm_handles[region.src_handle].pages*EMM_PAGE_SIZE < (region.src_page_seg*EMM_PAGE_SIZE)+region.src_offset+region.bytes) return EMM_LOG_OUT_RANGE;
+		if ((emm_handles[region.src_handle].pages*EMM_PAGE_SIZE) < ((region.src_page_seg*EMM_PAGE_SIZE)+region.src_offset+region.bytes)) return EMM_LOG_OUT_RANGE;
 		src_handle=emm_handles[region.src_handle].mem;
 		Bitu pages=region.src_page_seg*4+(region.src_offset/MEM_PAGE_SIZE);
 		for (;pages>0;pages--) src_handle=MEM_NextHandle(src_handle);