diff --git a/atari/Makefile.defaults b/atari/Makefile.defaults
index 155ba8d2d..a8b1857df 100644
--- a/atari/Makefile.defaults
+++ b/atari/Makefile.defaults
@@ -38,7 +38,7 @@
 
   # Configure the CPU target
   # Valid options: 68000, 68020-60, 5475 (coldfire)
-  ATARI_ARCH = 68020-60
+  ATARIARCH = 68020-60
 
   # enable optimizations
   # -O2 is currently broken with m68000 / m68020-60 builds 
diff --git a/atari/Makefile.target b/atari/Makefile.target
index fdd4ee48f..e8c51f0ea 100644
--- a/atari/Makefile.target
+++ b/atari/Makefile.target
@@ -11,19 +11,19 @@
 STRIP := $(wildcard $(GCCSDK_INSTALL_CROSSBIN)/*strip)
 STACK := $(wildcard $(GCCSDK_INSTALL_CROSSBIN)/*stack)
 
-ifeq ($(ATARI_ARCH),68000)
+ifeq ($(ATARIARCH),68000)
 PRGSUFFIX := 000.app
 PKGNAME := ns000.zip
 endif
 
-ifeq ($(ATARI_ARCH),68020-60)
+ifeq ($(ATARIARCH),68020-60)
 CFLAGS += -m68020-60
 LDFLAGS += -m68020-60
 PRGSUFFIX := 020.app
 PKGNAME := ns020.zip
 endif
 
-ifeq ($(ATARI_ARCH),5475)
+ifeq ($(ATARIARCH),v4e)
 CFLAGS += -mcpu=5475
 LDFLAGS += -mcpu=5475
 PRGSUFFIX := v4e.app