diff --git a/desmume/src/utils/vfat.cpp b/desmume/src/utils/vfat.cpp
index 0d4fa0b88..278bf590f 100644
--- a/desmume/src/utils/vfat.cpp
+++ b/desmume/src/utils/vfat.cpp
@@ -199,7 +199,7 @@ bool VFAT::build(const char* path, int extra_MB)
 
 	if(dataSectors>=(0x80000000>>9))
 	{
-		printf("error allocating memory for fat (%d KBytes)\n",(dataSectors*512)/1024);
+		printf("error allocating memory for fat (%llu KBytes)\n",(dataSectors*512)/1024);
 		printf("total fat sizes > 2GB are never going to work\n");
 	}
 	
@@ -210,7 +210,7 @@ bool VFAT::build(const char* path, int extra_MB)
 	}
 	catch(std::bad_alloc)
 	{
-		printf("error allocating memory for fat (%d KBytes)\n",(dataSectors*512)/1024);
+		printf("error allocating memory for fat (%llu KBytes)\n",(dataSectors*512)/1024);
 		printf("(out of memory)\n");
 		return false;
 	}
@@ -255,4 +255,4 @@ EMUFILE* VFAT::detach()
 	EMUFILE* ret = file;
 	file = NULL;
 	return ret;
-}
\ No newline at end of file
+}