diff --git a/cocoa/Makefile.defaults b/cocoa/Makefile.defaults
index 501d17585..50da6674d 100644
--- a/cocoa/Makefile.defaults
+++ b/cocoa/Makefile.defaults
@@ -29,7 +29,7 @@ NETSURF_USE_JPEG := NO
 NETSURF_USE_IMAGEIO := YES
 
 DEVELOPER_PATH := /Developer
-MACOSX_VERSION := 10.5
+MACOSX_VERSION := 10.6
 SDK_VERSION := $(MACOSX_VERSION)
 
 # Optimisation levels
diff --git a/cocoa/Makefile.target b/cocoa/Makefile.target
index eae3fae92..815243c61 100644
--- a/cocoa/Makefile.target
+++ b/cocoa/Makefile.target
@@ -25,8 +25,6 @@ endif
 # for timerisset()
 CFLAGS += -D_DARWIN_C_SOURCE
 
-MACOSX_VERSION ?= 10.6
-SDK_VERSION ?= $(MACOSX_VERSION)
 SDK_PATH ?= $(DEVELOPER_PATH)/SDKs/MacOSX$(SDK_VERSION).sdk
 SDK_FLAGS := -isysroot $(SDK_PATH) -mmacosx-version-min=$(MACOSX_VERSION)
 CFLAGS :=  $(SDK_FLAGS) $(CFLAGS)