diff --git a/src/global.hpp b/src/global.hpp
index eceb53031f5..42b1c61104f 100644
--- a/src/global.hpp
+++ b/src/global.hpp
@@ -28,11 +28,6 @@
 #error "Compilation with NDEBUG defined isn't supported, Wesnoth depends on asserts."
 #endif
 
-// To allow using some optional C++20 features
-#if __cplusplus >= 202002L
-#define HAVE_CXX20
-#endif
-
 #if defined(__clang__)
 #endif
 
diff --git a/src/picture.cpp b/src/picture.cpp
index 649baadd3b3..e1cbcfcda92 100644
--- a/src/picture.cpp
+++ b/src/picture.cpp
@@ -79,11 +79,7 @@ class cache_type
 public:
 	bool in_cache(const locator& item) const
 	{
-#ifdef HAVE_CXX20
-		return content_.contains(item);
-#else
-		return content_.find(item) != content_.end();
-#endif
+		return content_.find(item) != content_.end(); // TODO C++20: use content_.contains()
 	}
 
 	/** Returns a pointer to the cached value, or nullptr if not found. */