diff --git a/scripts/src/cpu.lua b/scripts/src/cpu.lua
index c3438a8661c..88fa672139b 100644
--- a/scripts/src/cpu.lua
+++ b/scripts/src/cpu.lua
@@ -1082,14 +1082,27 @@ end
 
 --------------------------------------------------
 -- MIPS R3000 (MIPS I/II) series
+--@src/devices/cpu/mips/r3000.h,CPUS["R3000"] = true
+--------------------------------------------------
+
+if (CPUS["R3000"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/cpu/mips/r3000.cpp",
+		MAME_DIR .. "src/devices/cpu/mips/r3000.h",
+	}
+end
+
+if (CPUS["R3000"]~=null or _OPTIONS["with-tools"]) then
+	table.insert(disasm_files , MAME_DIR .. "src/devices/cpu/mips/r3kdasm.cpp")
+end
+
+--------------------------------------------------
 -- MIPS R4000 (MIPS III/IV) series
 --@src/devices/cpu/mips/mips3.h,CPUS["MIPS"] = true
 --------------------------------------------------
 
 if (CPUS["MIPS"]~=null) then
 	files {
-		MAME_DIR .. "src/devices/cpu/mips/r3000.cpp",
-		MAME_DIR .. "src/devices/cpu/mips/r3000.h",
 		MAME_DIR .. "src/devices/cpu/mips/mips3com.cpp",
 		MAME_DIR .. "src/devices/cpu/mips/mips3com.h",
 		MAME_DIR .. "src/devices/cpu/mips/mips3.cpp",
@@ -1101,7 +1114,6 @@ if (CPUS["MIPS"]~=null) then
 end
 
 if (CPUS["MIPS"]~=null or _OPTIONS["with-tools"]) then
-	table.insert(disasm_files , MAME_DIR .. "src/devices/cpu/mips/r3kdasm.cpp")
 	table.insert(disasm_files , MAME_DIR .. "src/devices/cpu/mips/mips3dsm.cpp")
 end
 
diff --git a/scripts/target/mame/arcade.lua b/scripts/target/mame/arcade.lua
index 45a9ed2d6be..fa2cc01d750 100644
--- a/scripts/target/mame/arcade.lua
+++ b/scripts/target/mame/arcade.lua
@@ -58,6 +58,7 @@ CPUS["JAGUAR"] = true
 CPUS["CUBEQCPU"] = true
 CPUS["ESRIP"] = true
 CPUS["MIPS"] = true
+CPUS["R3000"] = true
 CPUS["PSX"] = true
 CPUS["SH2"] = true
 CPUS["SH4"] = true
diff --git a/scripts/target/mame/mess.lua b/scripts/target/mame/mess.lua
index 99f515aab69..c8c7f3d9747 100644
--- a/scripts/target/mame/mess.lua
+++ b/scripts/target/mame/mess.lua
@@ -58,6 +58,7 @@ CPUS["JAGUAR"] = true
 CPUS["CUBEQCPU"] = true
 CPUS["ESRIP"] = true
 CPUS["MIPS"] = true
+CPUS["R3000"] = true
 CPUS["PSX"] = true
 CPUS["SH2"] = true
 CPUS["SH4"] = true