diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index dc3a0fb1946ca8e152fef949fefe02b7341207d3..4c9304e92ff526295096f38bfab35d20e4c531b0 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1326,8 +1326,8 @@ intel_bios_init(struct drm_device *dev)
 
 	bdb = get_bdb_header(vbt);
 
-	DRM_DEBUG_KMS("VBT signature \"%20s\", BDB version %d\n",
-		      vbt->signature, bdb->version);
+	DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
+		      (int)sizeof(vbt->signature), vbt->signature, bdb->version);
 
 	/* Grab useful general definitions */
 	parse_general_features(dev_priv, bdb);