diff --git a/src/southbridge/amd/cimx/sb900/early.c b/src/southbridge/amd/cimx/sb900/early.c
index 5ebe47e5fb..1aa9a5a4ba 100644
--- a/src/southbridge/amd/cimx/sb900/early.c
+++ b/src/southbridge/amd/cimx/sb900/early.c
@@ -39,7 +39,7 @@ void sb_poweron_init(void)
 	//Enable/Disable PCI Bridge Device 14 Function 4.
 	outb(0xEA, 0xCD6);
 	data = inb(0xCD7);
-	data &= !BIT0;
+	data &= ~BIT0;
 	if (!CONFIG(PCIB_ENABLE)) {
 		data |= BIT0;
 	}