diff --git a/src/ai/ai_info.cpp b/src/ai/ai_info.cpp
index 9528f32cd1..60503f7dd5 100644
--- a/src/ai/ai_info.cpp
+++ b/src/ai/ai_info.cpp
@@ -359,7 +359,10 @@ int AIInfo::GetSettingDefaultValue(const char *name)
 	AILibrary *library = new AILibrary();
 
 	SQInteger res = AIFileInfo::Constructor(vm, library, true);
-	if (res != 0) return res;
+	if (res != 0) {
+		delete library;
+		return res;
+	}
 
 	/* Register the Library to the base system */
 	library->base->RegisterLibrary(library);
diff --git a/src/ai/ai_scanner.cpp b/src/ai/ai_scanner.cpp
index 3c74cdb92b..d7fc258c7b 100644
--- a/src/ai/ai_scanner.cpp
+++ b/src/ai/ai_scanner.cpp
@@ -277,7 +277,10 @@ void AIScanner::RegisterLibrary(AILibrary *library)
 
 	if (this->library_list.find(library_name) != this->library_list.end()) {
 		/* This AI was already registered */
-		if (strcmp(this->library_list[library_name]->GetMainScript(), library->GetMainScript()) == 0) return;
+		if (strcmp(this->library_list[library_name]->GetMainScript(), library->GetMainScript()) == 0) {
+			delete library;
+			return;
+		}
 
 		DEBUG(ai, 0, "Registering two libraries with the same name and version");
 		DEBUG(ai, 0, "  1: %s", this->library_list[library_name]->GetMainScript());
@@ -306,7 +309,10 @@ void AIScanner::RegisterAI(AIInfo *info)
 
 	if (this->info_list.find(ai_name) != this->info_list.end()) {
 		/* This AI was already registered */
-		if (strcmp(this->info_list[ai_name]->GetMainScript(), info->GetMainScript()) == 0) return;
+		if (strcmp(this->info_list[ai_name]->GetMainScript(), info->GetMainScript()) == 0) {
+			delete info;
+			return;
+		}
 
 		DEBUG(ai, 0, "Registering two AIs with the same name and version");
 		DEBUG(ai, 0, "  1: %s", this->info_list[ai_name]->GetMainScript());