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-rw-r--r--src/cpu/intel/haswell/haswell.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cpu/intel/haswell/haswell.h b/src/cpu/intel/haswell/haswell.h
index 608c5b5908..6612509e49 100644
--- a/src/cpu/intel/haswell/haswell.h
+++ b/src/cpu/intel/haswell/haswell.h
@@ -112,7 +112,7 @@
/* PCODE MMIO communications live in the MCHBAR. */
#define BIOS_MAILBOX_INTERFACE 0x5da4
-#define MAILBOX_RUN_BUSY (1 << 31)
+#define MAILBOX_RUN_BUSY (1UL << 31)
#define MAILBOX_BIOS_CMD_READ_PCS 1
#define MAILBOX_BIOS_CMD_WRITE_PCS 2
#define MAILBOX_BIOS_CMD_READ_CALIBRATION 0x509