diff --git a/src/android/Context.hxx b/src/android/Context.hxx
index bdbdc641f..6be0735a2 100644
--- a/src/android/Context.hxx
+++ b/src/android/Context.hxx
@@ -30,10 +30,10 @@ public:
 	Context(JNIEnv *env, jobject obj) noexcept
 		:Java::GlobalObject(env, obj) {}
 
-	gcc_pure
+	[[gnu::pure]]
 	AllocatedPath GetCacheDir(JNIEnv *env) const noexcept;
 
-	gcc_pure
+	[[gnu::pure]]
 	AudioManager *GetAudioManager(JNIEnv *env) noexcept;
 };
 
diff --git a/src/android/Environment.hxx b/src/android/Environment.hxx
index f8b964deb..15cc604cd 100644
--- a/src/android/Environment.hxx
+++ b/src/android/Environment.hxx
@@ -33,10 +33,10 @@ namespace Environment {
 	/**
 	 * Determine the mount point of the external SD card.
 	 */
-	gcc_pure
+	[[gnu::pure]]
 	AllocatedPath getExternalStorageDirectory() noexcept;
 
-	gcc_pure
+	[[gnu::pure]]
 	AllocatedPath getExternalStoragePublicDirectory(const char *type) noexcept;
 }