diff --git a/util/amdfwtool/amdfwtool.c b/util/amdfwtool/amdfwtool.c
index f958aba..b08a961 100644
--- a/util/amdfwtool/amdfwtool.c
+++ b/util/amdfwtool/amdfwtool.c
@@ -377,6 +377,9 @@
 	current = AMD_ROMSIG_OFFSET;
 	amd_romsig = rom + AMD_ROMSIG_OFFSET;
 	amd_romsig[0] = 0x55AA55AA; /* romsig */
+	amd_romsig[1] = 0;
+	amd_romsig[2] = 0;
+	amd_romsig[3] = 0;
 
 	current += 0x20;	    /* size of ROMSIG */