diff --git a/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj b/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
index a1fccf3ee..464c16bdd 100644
--- a/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj	
+++ b/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj	
@@ -6702,6 +6702,7 @@
 					"$(OTHER_CFLAGS)",
 					"-Wreorder",
 				);
+				OTHER_SWIFT_FLAGS = "-D DEBUG";
 				PRODUCT_BUNDLE_IDENTIFIER = "TH.Clock-Signal";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Clock Signal/ClockSignal-Bridging-Header.h";
diff --git a/OSBindings/Mac/Clock Signal/MachinePicker/MachinePicker.swift b/OSBindings/Mac/Clock Signal/MachinePicker/MachinePicker.swift
index af220040a..719ce6883 100644
--- a/OSBindings/Mac/Clock Signal/MachinePicker/MachinePicker.swift	
+++ b/OSBindings/Mac/Clock Signal/MachinePicker/MachinePicker.swift	
@@ -86,8 +86,8 @@ class MachinePicker: NSObject, NSTableViewDataSource, NSTableViewDelegate {
 
 		// TEMPORARY: remove the Apple IIgs and PC compatible options.
 		// Neither is yet a fully-working machine.
-		#if RELEASE
-		for hidden in ["appleiigs" /*, "pc" */] {
+		#if !DEBUG
+		for hidden in ["appleiigs", "pc"] {
 			let tabIndex = machineSelector.indexOfTabViewItem(withIdentifier: hidden)
 			machineSelector.removeTabViewItem(machineSelector.tabViewItem(at: tabIndex))
 		}