diff --git a/SheepShaver/src/MacOSX/SheepShaver.xcodeproj/project.pbxproj b/SheepShaver/src/MacOSX/SheepShaver.xcodeproj/project.pbxproj
index 7d44b248..be6efcae 100644
--- a/SheepShaver/src/MacOSX/SheepShaver.xcodeproj/project.pbxproj
+++ b/SheepShaver/src/MacOSX/SheepShaver.xcodeproj/project.pbxproj
@@ -1648,6 +1648,8 @@
 				INFOPLIST_PREFIX_HEADER = "";
 				INFOPLIST_PREPROCESS = NO;
 				INSTALL_PATH = "$(HOME)/Applications";
+				MACOSX_DEPLOYMENT_TARGET = 10.4;
+				"MACOSX_DEPLOYMENT_TARGET[arch=x86_64]" = 10.5;
 				OTHER_CFLAGS = "";
 				OTHER_CPLUSPLUSFLAGS = "$(OTHER_CFLAGS)";
 				OTHER_LDFLAGS = (
@@ -1665,9 +1667,8 @@
 				PREBINDING = NO;
 				PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = NO;
 				PRODUCT_NAME = SheepShaver;
-				SDKROOT = "$(DEVELOPER_SDK_DIR)/MacOSX10.5.sdk";
-				"SDKROOT[arch=i386]" = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
-				"SDKROOT[arch=ppc]" = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
+				SDKROOT = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
+				"SDKROOT[arch=x86_64]" = "$(DEVELOPER_SDK_DIR)/MacOSX10.5.sdk";
 				WARNING_LDFLAGS = "";
 			};
 			name = Debug;
@@ -1719,6 +1720,8 @@
 				INFOPLIST_PREFIX_HEADER = "";
 				INFOPLIST_PREPROCESS = NO;
 				INSTALL_PATH = "$(HOME)/Applications";
+				MACOSX_DEPLOYMENT_TARGET = 10.4;
+				"MACOSX_DEPLOYMENT_TARGET[arch=x86_64]" = 10.5;
 				OTHER_CFLAGS = "";
 				OTHER_CPLUSPLUSFLAGS = "$(OTHER_CFLAGS)";
 				OTHER_LDFLAGS = (
@@ -1736,9 +1739,8 @@
 				PREBINDING = NO;
 				PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = NO;
 				PRODUCT_NAME = SheepShaver;
-				SDKROOT = "$(DEVELOPER_SDK_DIR)/MacOSX10.5.sdk";
-				"SDKROOT[arch=i386]" = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
-				"SDKROOT[arch=ppc]" = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
+				SDKROOT = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
+				"SDKROOT[arch=x86_64]" = "$(DEVELOPER_SDK_DIR)/MacOSX10.5.sdk";
 				ZERO_LINK = NO;
 			};
 			name = Release;