diff --git a/Sources/XcodeProj/Utils/BuildSettingsProvider.swift b/Sources/XcodeProj/Utils/BuildSettingsProvider.swift
index bd7fc9d1..574f50ca 100644
--- a/Sources/XcodeProj/Utils/BuildSettingsProvider.swift
+++ b/Sources/XcodeProj/Utils/BuildSettingsProvider.swift
@@ -347,7 +347,7 @@ public class BuildSettingsProvider {
         case .debug:
             return [
                 "SWIFT_OPTIMIZATION_LEVEL": "-Onone",
-                "SWIFT_ACTIVE_COMPILATION_CONDITIONS": "$(inherited) DEBUG",
+                "SWIFT_ACTIVE_COMPILATION_CONDITIONS": ["$(inherited)", "DEBUG"],
                 "SWIFT_COMPILATION_MODE": "singlefile",
             ]
         case .release:
diff --git a/Tests/XcodeProjTests/Utils/BuildSettingsProviderTests.swift b/Tests/XcodeProjTests/Utils/BuildSettingsProviderTests.swift
index 3f98b204..4b65f3e1 100644
--- a/Tests/XcodeProjTests/Utils/BuildSettingsProviderTests.swift
+++ b/Tests/XcodeProjTests/Utils/BuildSettingsProviderTests.swift
@@ -163,7 +163,7 @@ class BuildSettingProviderTests: XCTestCase {
                 "@executable_path/Frameworks",
                 "@loader_path/Frameworks",
             ],
-            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": "$(inherited) DEBUG",
+            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": ["$(inherited)", "DEBUG"],
             "SWIFT_COMPILATION_MODE": "singlefile",
             "SWIFT_OPTIMIZATION_LEVEL": "-Onone",
             "TARGETED_DEVICE_FAMILY": "1,2",
@@ -186,7 +186,7 @@ class BuildSettingProviderTests: XCTestCase {
                 "@executable_path/Frameworks",
                 "@loader_path/Frameworks",
             ],
-            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": "$(inherited) DEBUG",
+            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": ["$(inherited)", "DEBUG"],
             "SWIFT_COMPILATION_MODE": "singlefile",
             "SWIFT_OPTIMIZATION_LEVEL": "-Onone",
             "TARGETED_DEVICE_FAMILY": "1,2",
@@ -209,7 +209,7 @@ class BuildSettingProviderTests: XCTestCase {
                 "@executable_path/../Frameworks",
                 "@loader_path/../Frameworks",
             ],
-            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": "$(inherited) DEBUG",
+            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": ["$(inherited)", "DEBUG"],
             "SWIFT_COMPILATION_MODE": "singlefile",
             "SWIFT_OPTIMIZATION_LEVEL": "-Onone",
         ])
@@ -230,7 +230,7 @@ class BuildSettingProviderTests: XCTestCase {
                 "@executable_path/Frameworks",
                 "@loader_path/Frameworks",
             ],
-            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": "$(inherited) DEBUG",
+            "SWIFT_ACTIVE_COMPILATION_CONDITIONS": ["$(inherited)", "DEBUG"],
             "SWIFT_COMPILATION_MODE": "singlefile",
             "SWIFT_OPTIMIZATION_LEVEL": "-Onone",
             "TARGETED_DEVICE_FAMILY": "3",