diff --git a/SwiftShell.xcodeproj/project.pbxproj b/SwiftShell.xcodeproj/project.pbxproj
index 9bbdc9c..652e98e 100644
--- a/SwiftShell.xcodeproj/project.pbxproj
+++ b/SwiftShell.xcodeproj/project.pbxproj
@@ -339,6 +339,7 @@
 				ENABLE_TESTABILITY = YES;
 				INFOPLIST_FILE = SwiftShell.xcodeproj/SwiftShell_Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
+				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
@@ -375,6 +376,7 @@
 				ENABLE_TESTABILITY = YES;
 				INFOPLIST_FILE = SwiftShell.xcodeproj/SwiftShell_Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
+				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";