diff --git a/lib/xilinx/bitstream_writer.cc b/lib/xilinx/bitstream_writer.cc
index 2744071c..809c06f1 100644
--- a/lib/xilinx/bitstream_writer.cc
+++ b/lib/xilinx/bitstream_writer.cc
@@ -16,7 +16,9 @@ typename BitstreamWriter<Spartan6>::header_t BitstreamWriter<Spartan6>::header_{
 // Per UG470 pg 80: Bus Width Auto Detection
 template <>
 typename BitstreamWriter<Series7>::header_t BitstreamWriter<Series7>::header_{
-    0xFFFFFFFF, 0x000000BB, 0x11220044, 0xFFFFFFFF, 0xFFFFFFFF, 0xAA995566};
+    0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
+    0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x000000BB, 0x11220044,
+    0xFFFFFFFF, 0xFFFFFFFF, 0xAA995566};
 
 template <>
 typename BitstreamWriter<UltraScale>::header_t
@@ -26,7 +28,10 @@ typename BitstreamWriter<UltraScale>::header_t
 template <>
 typename BitstreamWriter<UltraScalePlus>::header_t
     BitstreamWriter<UltraScalePlus>::header_{
-        0xFFFFFFFF, 0x000000BB, 0x11220044, 0xFFFFFFFF, 0xFFFFFFFF, 0xAA995566};
+        0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
+        0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
+        0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x000000BB, 0x11220044,
+        0xFFFFFFFF, 0xFFFFFFFF, 0xAA995566};
 
 uint32_t packet2header(
     const ConfigurationPacket<Spartan6ConfigurationRegister>& packet) {