diff --git a/Signal.xcodeproj/project.pbxproj b/Signal.xcodeproj/project.pbxproj
index 4596eb208b..4912a7e974 100644
--- a/Signal.xcodeproj/project.pbxproj
+++ b/Signal.xcodeproj/project.pbxproj
@@ -4125,6 +4125,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @executable_path/../../Frameworks";
 				MTL_ENABLE_DEBUG_INFO = YES;
+				OTHER_SWIFT_FLAGS = "$(inherited) -D DEBUG";
 				PRODUCT_BUNDLE_IDENTIFIER = org.whispersystems.signal.shareextension;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -4243,6 +4244,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = YES;
+				OTHER_SWIFT_FLAGS = "$(inherited) -D DEBUG";
 				PRODUCT_BUNDLE_IDENTIFIER = org.whispersystems.signal.SignalMessaging;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
@@ -4545,6 +4547,7 @@
 				);
 				LLVM_LTO = NO;
 				OTHER_LDFLAGS = "$(inherited)";
+				OTHER_SWIFT_FLAGS = "$(inherited) -D DEBUG";
 				PRODUCT_BUNDLE_IDENTIFIER = org.whispersystems.signal;
 				PRODUCT_NAME = Signal;
 				PROVISIONING_PROFILE = "";
@@ -4670,6 +4673,7 @@
 					"-ObjC",
 					"$(inherited)",
 				);
+				OTHER_SWIFT_FLAGS = "$(inherited) -D DEBUG";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.whispersystems.${PRODUCT_NAME:rfc1034identifier}";
 				PRODUCT_NAME = SignalTests;
 				PROVISIONING_PROFILE = "";