diff --git a/scripts/target/mame/arcade.lua b/scripts/target/mame/arcade.lua
index 62b785c1660..db7a4a86bed 100644
--- a/scripts/target/mame/arcade.lua
+++ b/scripts/target/mame/arcade.lua
@@ -1444,8 +1444,8 @@ files {
 	MAME_DIR .. "src/mame/drivers/1942.cpp",
 	MAME_DIR .. "src/mame/includes/1942.h",
 	MAME_DIR .. "src/mame/video/1942.cpp",
-  MAME_DIR .. "src/mame/audio/nl_1942.cpp",
-  MAME_DIR .. "src/mame/audio/nl_1942.h",
+	MAME_DIR .. "src/mame/audio/nl_1942.cpp",
+	MAME_DIR .. "src/mame/audio/nl_1942.h",
 	MAME_DIR .. "src/mame/drivers/1943.cpp",
 	MAME_DIR .. "src/mame/includes/1943.h",
 	MAME_DIR .. "src/mame/video/1943.cpp",
@@ -3089,8 +3089,8 @@ files {
 	MAME_DIR .. "src/mame/drivers/popeye.cpp",
 	MAME_DIR .. "src/mame/includes/popeye.h",
 	MAME_DIR .. "src/mame/video/popeye.cpp",
-  MAME_DIR .. "src/mame/audio/nl_popeye.cpp",
-  MAME_DIR .. "src/mame/audio/nl_popeye.h",
+	MAME_DIR .. "src/mame/audio/nl_popeye.cpp",
+	MAME_DIR .. "src/mame/audio/nl_popeye.h",
 	MAME_DIR .. "src/mame/drivers/punchout.cpp",
 	MAME_DIR .. "src/mame/includes/punchout.h",
 	MAME_DIR .. "src/mame/video/punchout.cpp",
@@ -4669,8 +4669,8 @@ files {
 	MAME_DIR .. "src/mame/drivers/clowndwn.cpp",
 	MAME_DIR .. "src/mame/drivers/clpoker.cpp",
 	MAME_DIR .. "src/mame/drivers/cocoloco.cpp",
-  MAME_DIR .. "src/mame/audio/nl_cocoloco.h",
-  MAME_DIR .. "src/mame/audio/nl_cocoloco.cpp",
+	MAME_DIR .. "src/mame/audio/nl_cocoloco.h",
+	MAME_DIR .. "src/mame/audio/nl_cocoloco.cpp",
 	MAME_DIR .. "src/mame/drivers/coinmstr.cpp",
 	MAME_DIR .. "src/mame/drivers/coinmvga.cpp",
 	MAME_DIR .. "src/mame/drivers/comebaby.cpp",