diff --git a/modules/mono/class_db_api_json.cpp b/modules/mono/class_db_api_json.cpp
index 71ccdb7aab6..4a6637434a7 100644
--- a/modules/mono/class_db_api_json.cpp
+++ b/modules/mono/class_db_api_json.cpp
@@ -30,6 +30,8 @@
 
 #include "class_db_api_json.h"
 
+#ifdef DEBUG_METHODS_ENABLED
+
 #include "core/io/json.h"
 #include "core/os/file_access.h"
 #include "core/project_settings.h"
@@ -240,3 +242,5 @@ void class_db_api_to_json(const String &p_output_file, ClassDB::APIType p_api) {
 
 	print_line(String() + "ClassDB API JSON written to: " + ProjectSettings::get_singleton()->globalize_path(p_output_file));
 }
+
+#endif // DEBUG_METHODS_ENABLED
diff --git a/modules/mono/class_db_api_json.h b/modules/mono/class_db_api_json.h
index 0aa9c209303..ddfe2debea1 100644
--- a/modules/mono/class_db_api_json.h
+++ b/modules/mono/class_db_api_json.h
@@ -31,9 +31,16 @@
 #ifndef CLASS_DB_API_JSON_H
 #define CLASS_DB_API_JSON_H
 
+// 'core/method_bind.h' defines DEBUG_METHODS_ENABLED, but it looks like we
+// cannot include it here. That's why we include it through 'core/class_db.h'.
 #include "core/class_db.h"
+
+#ifdef DEBUG_METHODS_ENABLED
+
 #include "core/ustring.h"
 
 void class_db_api_to_json(const String &p_output_file, ClassDB::APIType p_api);
 
+#endif // DEBUG_METHODS_ENABLED
+
 #endif // CLASS_DB_API_JSON_H
diff --git a/modules/mono/mono_gd/gd_mono.cpp b/modules/mono/mono_gd/gd_mono.cpp
index 096ad0f5e34..2497f083b58 100644
--- a/modules/mono/mono_gd/gd_mono.cpp
+++ b/modules/mono/mono_gd/gd_mono.cpp
@@ -719,6 +719,7 @@ bool GDMono::_try_load_api_assemblies() {
 void GDMono::_load_api_assemblies() {
 
 	if (!_try_load_api_assemblies()) {
+#ifdef TOOLS_ENABLED
 		// The API assemblies are out of sync. Fine, try one more time, but this time
 		// update them from the prebuilt assemblies directory before trying to load them.
 
@@ -752,11 +753,9 @@ void GDMono::_load_api_assemblies() {
 					ERR_PRINT("The loaded assembly '" CORE_API_ASSEMBLY_NAME "' is in sync, but the cache update failed");
 				}
 
-#ifdef TOOLS_ENABLED
 				if (editor_api_assembly_out_of_sync) {
 					ERR_PRINT("The assembly '" EDITOR_API_ASSEMBLY_NAME "' is out of sync");
 				}
-#endif
 
 				CRASH_NOW();
 			} else {
@@ -764,6 +763,10 @@ void GDMono::_load_api_assemblies() {
 				CRASH_NOW();
 			}
 		}
+#else
+		ERR_EXPLAIN("Failed to load one of the API assemblies");
+		CRASH_NOW();
+#endif
 	}
 }