diff --git a/.gitignore b/.gitignore
index ab2c0c4..ac9a11d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@
 
 # Ignore build products from tools
 tools/**/*.o
+tools/**/*.d
 tools/renesas/rcar_layout_create/*.bin
 tools/renesas/rcar_layout_create/*.srec
 tools/renesas/rcar_layout_create/*.map