diff --git a/tools/ioemu/hw/e1000.c b/tools/ioemu/hw/e1000.c
index fde815bd0a..48621f582f 100644
--- a/tools/ioemu/hw/e1000.c
+++ b/tools/ioemu/hw/e1000.c
@@ -48,7 +48,7 @@ static int debugflags = DBGBIT(TXERR) | DBGBIT(GENERAL);
 #endif
 
 #define IOPORT_SIZE       0x40
-#define PNPMMIO_SIZE      0x60000
+#define PNPMMIO_SIZE      0x20000
 
 /*
  * HW models: