diff --git a/src/gallium/drivers/r600/.dir-locals.el b/src/gallium/drivers/r600/.dir-locals.el
index 4e35c129e70..15cd68edb0a 100644
--- a/src/gallium/drivers/r600/.dir-locals.el
+++ b/src/gallium/drivers/r600/.dir-locals.el
@@ -1,5 +1,5 @@
 ((prog-mode
-  (indent-tabs-mode . true)
+  (indent-tabs-mode . t)
   (tab-width . 8)
   (c-basic-offset . 8)
   (c-file-style . "stroustrup")
diff --git a/src/gallium/drivers/radeon/.dir-locals.el b/src/gallium/drivers/radeon/.dir-locals.el
index 4e35c129e70..15cd68edb0a 100644
--- a/src/gallium/drivers/radeon/.dir-locals.el
+++ b/src/gallium/drivers/radeon/.dir-locals.el
@@ -1,5 +1,5 @@
 ((prog-mode
-  (indent-tabs-mode . true)
+  (indent-tabs-mode . t)
   (tab-width . 8)
   (c-basic-offset . 8)
   (c-file-style . "stroustrup")
diff --git a/src/gallium/drivers/radeonsi/.dir-locals.el b/src/gallium/drivers/radeonsi/.dir-locals.el
index 4e35c129e70..15cd68edb0a 100644
--- a/src/gallium/drivers/radeonsi/.dir-locals.el
+++ b/src/gallium/drivers/radeonsi/.dir-locals.el
@@ -1,5 +1,5 @@
 ((prog-mode
-  (indent-tabs-mode . true)
+  (indent-tabs-mode . t)
   (tab-width . 8)
   (c-basic-offset . 8)
   (c-file-style . "stroustrup")
diff --git a/src/mesa/drivers/dri/nouveau/.dir-locals.el b/src/mesa/drivers/dri/nouveau/.dir-locals.el
index 774f023ae6f..9b3ddf52461 100644
--- a/src/mesa/drivers/dri/nouveau/.dir-locals.el
+++ b/src/mesa/drivers/dri/nouveau/.dir-locals.el
@@ -1,5 +1,5 @@
 ((prog-mode
-  (indent-tabs-mode . true)
+  (indent-tabs-mode . t)
   (tab-width . 8)
   (c-basic-offset . 8)
   (c-file-style . "stroustrup")